Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec96367a0656d20…

MALICIOUS

PDF

80.9 KB Created: 2021-06-07 19:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d7f662c39277d45029d3130e990b40 SHA-1: ae093f30f508c1c509c373d459b03a480112695b SHA-256: cec96367a0656d203d3b3abc216bebbb445e04554dfa1390614b1f4f5734eaf4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The file contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=unit+conversion+practice+problems+with+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4390055/normal_6023f9e4c7b7e.pdf
    • https://cdn-cms.f-static.net/uploads/4388598/normal_6029335edea97.pdf
    • https://cdn-cms.f-static.net/uploads/4476783/normal_60404daf1ba09.pdf
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fcb03b064fd2.pdf
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/vuvenufifuriv.pdf
    • https://cdn-cms.f-static.net/uploads/4427811/normal_6068773179e90.pdf
    • https://static.s123-cdn-static.com/uploads/4466151/normal_600052e99d439.pdf
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fd7c65b2e32e.pdf
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5fc8474d297a2.pdf
    • https://cdn-cms.f-static.net/uploads/4454287/normal_601f91e032339.pdf
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fc82bd5c9c9f.pdf
    • https://cdn-cms.f-static.net/uploads/4384484/normal_6051428775619.pdf
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/damumaxeridu_muvapekiposuv_xetadofutud.pdf
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fcd6ede68cbc.pdf
    • https://static.s123-cdn-static.com/uploads/4428069/normal_5ffd3fc172335.pdf
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/5b3c07c8d89212.pdf
    • https://static.s123-cdn-static.com/uploads/4411245/normal_5fde9f63a2186.pdf
    • https://cdn-cms.f-static.net/uploads/4496607/normal_6059d3c4c22e2.pdf
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/6220988.pdf
    • https://cdn-cms.f-static.net/uploads/4499319/normal_60bdcb2877b40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6434c5da-c2ec-4a73-a43e-3b34280710d0/how_long_should_an_autopsy_report_take.pdf
    • https://uploads.strikinglycdn.com/files/f0d54bf6-1297-4131-b551-c667582f8704/gazanasobonabeguxedi.pdf
    • https://uploads.strikinglycdn.com/files/747b29e6-c0a7-46e0-a44a-41b7ea63d376/laptop_motherboard_chip_level_repair_guide.pdf
    • https://uploads.strikinglycdn.com/files/0f0a67fb-13bb-4a6c-93fb-d0bc5633eaab/42845610025.pdf
    • https://uploads.strikinglycdn.com/files/c4942c19-f510-4dae-8080-a52035aeb254/23320138532.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_off0000fac5.bin
6f514860037e715e56763ec2993bd525693b66e83881005e1142bf5ba26b5b66
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 5676 bytes
font_01_sfnt_off00010dfa.bin
3dfde6b376b8cfc1787f1d23ab2e4541ef5e1d9ea9b2f2b98d8744a5c07c6fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 11608 bytes