Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c8adaddd3224e8…

MALICIOUS

PDF

97.2 KB Created: 2021-05-01 03:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 66c82d92df29cf18f5c961b7b38e5af7 SHA-1: e182a4e48742e3e22a76bcfc5ade6b6e80ee2049 SHA-256: f0c8adaddd3224e80ec4f3c1a7f8f56963b078f9784e08e4a7057c8345d1d7bf
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One URL, 'https://leonvi.ru/strik?utm_term=how+to+delete+text+messages+on+verizon+lg+flip+phone', is directly embedded in the document body, indicating a potential phishing or redirection attempt. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=how+to+delete+text+messages+on+verizon+lg+flip+phone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451027/normal_5ffab8df2d35d.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/Ahitugd/vukulinidokasudonu.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/bunch_of_thoughts_book_in_marathi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dUfgeu0/31241452860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_6015c0e01ad15.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/ganutabewisadidax.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/DJTdggs/father_and_son_lyrics_cat_stevens_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/GSiigeB/walajuxinotonobigojinuzed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5fca174c4723d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5ffbae6dce73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_60439d436941a.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/bhc36jc/cruise_lines_covid_testing.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/ijWRLja/miraculous_ladybug_season_4_release_date_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/gcgcih2/39416594295.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/9DWifii/seven_kingdoms_gry_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/asthma_sign_guidelines_2017.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_379e84b710304f4abb4aea807aec2880.pdf?index=trueIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/propiedades_fisicas_y_quimicas_de_los_alcanos.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/sotovuxofonazelumexigon.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_d91e09c82f5c4e848795f3e16a28f708.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_a75596be1fd54d65a9b19e218396b743.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_fffce3aec27c4a8e8a6e2f02c177add8.pdf?index=trueIn PDF document text
    • http://pitigapevede.onlinewebshop.net/xenasakubojafoxodaxugizi.pdfIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_732d5216e1b84cb2a1255a647e8b72bc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 5688 bytes
SHA-256: 2a3c56c522704a89d2e9d49fbc0598dddf9221f361c86a6d2e213d260c5e6059
font_02_sfnt_off000115f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 8364 bytes
SHA-256: 624b108c29625e690bf2103de3ec42f468a139f406b4538c40b1c300045673ad
font_03_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 10944 bytes
SHA-256: 4cc7877e35c0e7d31ca8505abb8104fc59d07118ffee4f2333ee43605b8fd55a
font_04_sfnt_off0001569a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569A 16256 bytes
SHA-256: 8cc6bcc2cf3defe0a88aedbd81e1c3d6ddceaf294630c8a268e5b6d92b2eedfb
font_05_sfnt_off00016bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF7 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df