Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bc45983f61c944…

MALICIOUS

PDF

79.3 KB Created: 2020-11-21 12:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341dbd18a355a0266d418d5af8029037 SHA-1: bf418948340c7a23198ab8bc95ecd2626280e3be SHA-256: e2bc45983f61c94481d1da6db4602de78feb147de5829430fb1e90e4fc38d265
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of the 'college prep algebra textbook answers' lure in the document body, combined with the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, strongly indicates a phishing or malware distribution attempt. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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
  • 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://traffking.ru/123?utm_term=college+prep+algebra+textbook+answers
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fae8d486f3ae.pdf
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5faedbb007665.pdf
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f872b053828f.pdf
    • https://romesezex.weebly.com/uploads/1/3/4/6/134605020/miburejerexopog-vizesati-xivof.pdf
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/9152089.pdf
    • https://xamudoniganotew.weebly.com/uploads/1/3/4/5/134509964/c105606acb.pdf
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/64c8cebdb018c8.pdf
    • https://wabumixa.weebly.com/uploads/1/3/4/5/134585451/pewenubasigos-naveluk-gopexomagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c28364f5-22c6-4473-b8eb-121f47df13c1/ode_an_die_freude_lyrics_german_and_english.pdf
    • https://s3.amazonaws.com/sefiwegegagu/jegurokigexidij.pdf
    • https://s3.amazonaws.com/kosipefojaw/google_sheets_importrange_limit.pdf
    • https://s3.amazonaws.com/lixasifasi/65022876145.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_off0000f901.bin
d4f237fc0c404f52b5c38a0acb5d39c83a9abf4966e835a80a6f8751f7b7a4d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 5256 bytes
font_01_sfnt_off00010b00.bin
c1908d33688cc6ff070a4e346af73004b0a80e7f16fa98ff5387c5660610a6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10992 bytes

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