Malicious PDF — malware analysis report

Static analysis result for SHA-256 778c3efd7d1b5f0a…

MALICIOUS

PDF

74.5 KB Created: 2021-04-05 09:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b7f289bd81bd32d054050dce279f5c1 SHA-1: 783b858167d08e5a81e1b92857b115cf32c329e0 SHA-256: 778c3efd7d1b5f0a895de158255838d704cbe29fd6930720b215d1944321de8e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, detected as a 'PDF SEO LINK FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=mountain+bike+chain+length+guide
    • https://luwimejimidilen.weebly.com/uploads/1/3/4/0/134040945/14a9883b70ca.pdf
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/df7322d68525.pdf
    • https://kevujabuguve.weebly.com/uploads/1/3/4/7/134745112/9cb8c47a0eef7fc.pdf
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/3b4fe0f2056.pdf
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/bukefat.pdf
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/90b938dce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/501b4871-99e4-43b0-b36b-5bbe6a262f1a/kikifer.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_ee1e310884c74527916f5d31ff59eac2.pdf?index=true
    • https://s3.amazonaws.com/padosumifubobo/vugigegewipovalogumu.pdf
    • https://s3.amazonaws.com/nowonovege/auburn_hills_police_department_accident_reports.pdf
    • https://uploads.strikinglycdn.com/files/a4ef343b-b669-4465-8764-d53c597e7594/lomavojafukubafupo.pdf
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_44b4c339e78544298cb91173acf70fe0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb2a107b-23f2-4d64-ab0f-feed0806d4fc/posalol.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_7eb8f78643bd44a7b5d4bb96f5800807.pdf?index=true
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_49875fbe645e44828a0fbdcbfc6935f9.pdf?index=true
    • https://s3.amazonaws.com/vovabagubajegeb/webewumitulazapizidutuzis.pdf
    • https://uploads.strikinglycdn.com/files/4ad9f45a-820e-4d11-b563-1871df74755e/33940454471.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b7.bin
e16b288263fa574c9e2eca705e22d5a7a66daa7710ab73eaef557c50ae177c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5136 bytes
font_01_sfnt_off0000f93c.bin
baee85dbd4156d478b957f787f8bcef631bbc1e27aafc9240e10aeeb2ea16c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 10484 bytes

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