Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b1e3c98ffb6284…

MALICIOUS

PDF

87.2 KB Created: 2021-03-15 12:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 708073f2296005ef2012cf0d147f179e SHA-1: d36871ba08707b86c2fa8298c86e541231787a03 SHA-256: 85b1e3c98ffb6284ad3feed829884caff790500683edc791a1d42b9f39559522
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of embedded links pointing to known malicious redirectors and disposable hosting services, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly support this assessment. The document's primary function appears to be directing users to external malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+political+landscape+of+california In PDF document text
    • https://cdn.sqhk.co/nubevitawil/Cqhfthj/11332425095.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/epidural_anesthesia_complications.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/AHiciav/bekarigemabewijekuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/83KmtQa/symbol_square_with_x_inside_word.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/mipudomilagugabaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/iLie92r/job_description_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/cO7ifYs/tower_defense_generals_td_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/ihjf859/viruses_are_alive_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/7q6gf1g/ledemiradulozenupiwe.pdfIn PDF document text
    • http://gubuxuk.scienceontheweb.net/is_super_asymmetry_true.pdfIn PDF document text
    • https://cdn.sqhk.co/zemakojunil/dmhiTV8/2321183190.pdfIn PDF document text
    • http://tixanijematewe.mypressonline.com/bertolt_brecht_poemas_y_canciones.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/beauty_and_the_beast_vocal_sheet_music.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/13163918420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_63bf3eb7111649ada0a7dac62983b3b7.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_6b979899b2ad44fb9bc3e3e9503ab323.pdf?index=trueIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/81535716613.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_3e1fc68e21ad42a9adbdb1779daf9823.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_450d2e75c2b54566922633450f9ea43a.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_adb5ad05b5d64661bf77027fbb623c17.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_c41e7a557e89489d8dc62a47a97b095a.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_8da445ec1487432391a8ba4166fd1ecf.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_7a15f83df6da43c582f2c8a1133372d6.pdf?index=trueIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_1d374190d579490f8d1fde895a179950.pdf?index=trueIn PDF document text
    • http://wenibeliso.atwebpages.com/mla_works_cited_file.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 5256 bytes
SHA-256: c6fe516b5d33c1ba22db73fc77b30004dac265fcf08f96c76b213f44f9f1e93f
font_01_sfnt_off00012aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABA 10804 bytes
SHA-256: c8e35bb7b96c6b2e88c3f6b90580f3946fbf4bde4f64870c68094c2e4c2c3da8