Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f2ef5986c2010e…

MALICIOUS

PDF

67.8 KB Created: 2020-12-04 13:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 675ff8ece027c077e6559c13cf610e20 SHA-1: d62e87ea8d6555afea540d3af70772991e9a5767 SHA-256: 22f2ef5986c2010e1e433d28dfd331612f674e0a1a868c7e994adfc14efe8483
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, many of which are to other PDFs, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URL points to a domain associated with suspicious activity.

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-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://trafffi.ru/aws?utm_term=bus+in+computer+full+form
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fa4b9f37272d.pdf
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/45191f83af9.pdf
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f895f0e3eb18.pdf
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5fbb249374d2c.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fa9397f68def.pdf
    • https://cdn-cms.f-static.net/uploads/4471692/normal_5fbd3001c248c.pdf
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f887050cddc1.pdf
    • https://cdn-cms.f-static.net/uploads/4425533/normal_5fb411377ba48.pdf
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5faa180291e47.pdf
    • https://bepopasexib.weebly.com/uploads/1/3/4/3/134356469/lojupomedenuwi_zemugete.pdf
    • https://cdn-cms.f-static.net/uploads/4459177/normal_5fba0b783c3e4.pdf
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fc6bdf6ac716.pdf
    • https://cdn-cms.f-static.net/uploads/4490133/normal_5fb444b333bdb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1bceeaf37e3b64642987/1606294479374/jozorim.pdf
    • https://s3.amazonaws.com/tesapibebujep/ruxemixemasuripubara.pdf
    • https://s3.amazonaws.com/vavapekadoliti/xetafina.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_off0000cb33.bin
f8aef433a5eae2e3f392c2613ed4452bd3fb53f1a3c53eb844305bd21187178d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 5000 bytes
font_01_sfnt_off0000dc26.bin
9aa659784f04faca15b4b9604f1c6ffc94a59abdcd92e01807df7f1b92b44c51
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 10768 bytes