Malicious PDF — malware analysis report

Static analysis result for SHA-256 4308f1c0b3d4c3ff…

MALICIOUS

PDF

76.1 KB Created: 2021-03-28 12:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 571727189c8cfd6d27207a79a19612cd SHA-1: 217bc96fc9dc5a5edf29f03c80fe825e96438bea SHA-256: 4308f1c0b3d4c3ff41b50c01298af4064a2dba4b498514b434669733be1ef111
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or phishing attempt. The primary URL, 'https://golowaki.ru/award?keyword=aptitude+question+papers+with+answers+pdf+free+download', is designed to appear as a legitimate resource for educational materials, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=aptitude+question+papers+with+answers+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4464077/normal_6015f44a8111c.pdf
    • https://zajadibagaku.weebly.com/uploads/1/3/5/3/135341716/0d58255.pdf
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5ffa5bc343406.pdf
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/gonafujejekow.pdf
    • https://gutoserenenew.weebly.com/uploads/1/3/2/6/132681448/e2e5f029.pdf
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/5771139.pdf
    • https://zopamege.weebly.com/uploads/1/3/5/9/135966764/vomugose_xoxagadekunerov.pdf
    • https://kolerekum.weebly.com/uploads/1/3/4/3/134350376/vomejomowudola-lufuxelox-lusem-salukeloxisinen.pdf
    • https://fowerorizer.weebly.com/uploads/1/3/1/8/131856705/5ea76c1ce.pdf
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5fcb56e8ac1b7.pdf
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/561c19.pdf
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/c76ca983.pdf
    • https://cdn-cms.f-static.net/uploads/4488558/normal_6057da0cd56a3.pdf
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/5b532aa5378b51.pdf
    • https://static.s123-cdn-static.com/uploads/4491155/normal_5ffa5f6c01fe1.pdf
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/7654604.pdf
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5ff082a04f0ea.pdf
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/nuxak_fawoxiva_guveluzodutil.pdf
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fc61b706108a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://webidiwotew.epizy.com/tuladimivoxu.pdf
    • http://tisigivikevutik.rf.gd/libro_aceites_esenciales_young_living.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_off0000eaeb.bin
d6ea5de0dec575d80e28ac8a60ac28b46123ba6632c6937d6950cfcaea0df302
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5336 bytes
font_01_sfnt_off0000fd1f.bin
afa35eb1966878d6996a008e8600cb2b40de4aaa3daecd8815f1cfe5ad01e27b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 10496 bytes