Malicious PDF — malware analysis report

Static analysis result for SHA-256 826da2212af0826f…

MALICIOUS

PDF

67.6 KB Created: 2021-01-06 15:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d56a04b8d2b83a7120c5a2a0b944d95d SHA-1: 0c1ab319ebbd34081eaa042c77fa7850eff89c37 SHA-256: 826da2212af0826f181cc4a8a134f321d01af0fdd5d1356786239e48d659fdd0
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafficel.ru/aws?utm_term=axton+guide+steam', is likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9541

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=axton+guide+steam
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/rorapuxodob_nazotepav_tunexatemapetom_bexijefa.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/4671102.pdf
    • https://xotinibawilufo.weebly.com/uploads/1/3/1/4/131437660/8a48444c7f1a522.pdf
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/tejurukolaviwu.pdf
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f95fdaf6e620.pdf
    • https://zipelademijup.weebly.com/uploads/1/3/4/0/134017001/xegol.pdf
    • https://gedokepapivit.weebly.com/uploads/1/3/4/4/134464903/xozuzalipebus.pdf
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/ferowenevuloxud.pdf
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/jivufob.pdf
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/nokopepulemuva_paroge_kunatalu_rapoj.pdf
    • https://zenefuzivoxog.weebly.com/uploads/1/3/4/1/134108933/7ff1d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitirew/android_studio_apk_export.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f173.bin
c84c3cf5621ef407f89147d59f46f648db3dda5330ed1ab7c753813e58a38d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 5076 bytes

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