Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdf44e290684288…

MALICIOUS

PDF

73.9 KB Created: 2021-01-12 01:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fb043f3322851b11907e5b560638ff5d SHA-1: e875405aa6e4385e79ad52c41ffdecc77202397d SHA-256: fbdf44e290684288e297f9b62179c69a7241cafffbde280f16e062c1d22eab50
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, 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 related to 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

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=good+night+image++tamil PDF link annotation
    • https://cdn.sqhk.co/kuzezajolu/GyhcLhi/87558799361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd6613327b5e.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/qoibjjj/88504210794.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/kokipotipudol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_5fabd25579a62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_5fc472b24769c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_5fa2e146930d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f8735610fea6.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/foduti-satipigex-bijivamuteta.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/5jh7rii/fofaxelafititizipera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/denajufula.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 4996 bytes
SHA-256: c275f5b8cb3c27755ce024757a8655b9f08a69cee52af79169cc9a116a65ddcd
font_01_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 4284 bytes
SHA-256: 182fe7e98c2a5b728c83da10d7ca105b18eeb7ab54afd0e705e3c2ab92674cb5
font_02_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10520 bytes
SHA-256: 48a0a83855634391f5e95fcdbee2ac742ce004acb7511a2a434fff3ec645a035

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