Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d842dbb1877005…

MALICIOUS

PDF

78.6 KB Created: 2021-04-07 13:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a651b3b560aa5cc2d34657891fe98501 SHA-1: 53a228f3bfcb4e86a7a8a59f2cb4a310178b4672 SHA-256: 89d842dbb18770055c958a8f256d141efae72461a22c273c058a47e79e9a087b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the structure of the document suggest it's designed to redirect users to potentially harmful sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • 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://resalured.ru/award?keyword=how+many+countries+in+the+world+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5ffe7a2293d77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416672/normal_5fffed885dd6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5ffcd893ecfa6.pdfIn PDF document text
    • http://fibufadal.iblogger.org/telugu_bedtime_stories_mp3.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/dojilozowiv.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/78493758333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fecd3e4a8884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_601a057d71b33.pdfIn PDF document text
    • http://matizaw.mywebcommunity.org/water_pollution_poster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_2572b2b1b20d4dc0b9e368ddbdc5bf4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b22b00-1162-4233-96c6-e753e4c20850/lejafufalefotoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02cf16aa-7702-4298-80a7-9e25863d8855/55049409626.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/73547662603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b72f1a8-5a51-4751-a7e1-b297eca9f462/genesis_v2100_green.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_4adc8bdf96824fc0a8fa6a9c8bc2a4c3.pdf?index=trueIn PDF document text
    • http://dunuruzofugavix.rf.gd/68337260703.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_3ff80d112618450c8fc2852dff602f48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf0bb4d-e151-40b9-ab60-6f6e8e6daafc/why_is_the_english_language_so_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd224c3-4314-4916-b422-6393dd8a5ebd/what_petroglyphs_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e62a8ce-fd37-4029-9763-29bb92487538/xerox_workcentre_3325_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5c4b71-ff0f-4e70-8bd7-914b5df765ba/winelidodexonusakowesofe.pdfIn PDF document text
    • http://nutajowaga.rf.gd/pdf_acrobat_reader_professional_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bb1edf-3855-4e24-9f09-597f740c09d6/kowupisep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a80eca7-8492-42f3-8e3a-fa89d979f47e/similarities_between_distance_and_displacement_in_tabular_form.pdfIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_c32059bfa3d04258b910c874efad8b71.pdf?index=trueIn PDF document text
    • http://rujidafedisezu.atwebpages.com/lista_de_verbos_regulares_irregulares_en_ingles.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_932b1ec3ce854856b9a520ead056bc3b.pdf?index=trueIn PDF document text
    • http://gefuwaw.atwebpages.com/51433965760.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_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 5552 bytes
SHA-256: 91c7719f6d95e52f2678b2593386642670fe20b4d902b8581e59b095a6bae4be
font_01_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10800 bytes
SHA-256: 5ded8153771c6d5bdd483a247252cba31821a52ea1f7c2ede4b9570ed07c115e