Malicious PDF — malware analysis report

Static analysis result for SHA-256 af230536ff64839f…

MALICIOUS

PDF

115.1 KB Created: 2020-12-13 17:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a69a08fe2a95530c94b80d5ce57a7805 SHA-1: 2618ce8998f695bdd006071f82fdb5be5045ea1c SHA-256: af230536ff64839fd44064d7b5ffcd3928990149ea43f7d48b1894a3701fd9a7
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for brand-impersonation credential phishing, specifically impersonating Norton. It also contains numerous external links, with one pointing to a redirector that leads to a phishing PDF. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/1495386.pdf.
  • 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://trafficel.ru/123?utm_term=local+winds+are+caused+by PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fd10588b93c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5fadfce35e90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f87600d27c57.pdfIn PDF document text
    • https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/1495386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5fb282240d2fe.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/gozifep/advanced_system_optimizer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/crash_team_racing_pre_order_bonus.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/jewivofalasikepiwoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee70de0-2665-4160-88e8-d6d4de4751c4/wifukuxis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1c9f00-2b14-452d-a360-7ce56d94563b/bebut.pdfIn PDF document text
    • https://doi.org/10.1007/1-402In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1A 2868 bytes
SHA-256: 84667e18e1ec54665731ed5952f47b7fc18aa9ca07ef4f419d3cb8d5bf0f0c5e
font_01_sfnt_off0001874d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1874D 5208 bytes
SHA-256: 381452927bc8e4ebddc8e4ba830e792ac5772634d9ed94cc86e09ff898460d36
font_02_sfnt_off00019928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19928 11172 bytes
SHA-256: 440a8971710f5195c2f16560c86356dc2d3f9486a8e8e085e6de5f9a298e2af7

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