Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63fa8809564c538…

MALICIOUS

PDF

77.8 KB Created: 2021-06-10 15:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec697400eec89530fdc3c81c5e827fe SHA-1: ae9710e80e8aab4f4668c6dd2c035aeb92e2680c SHA-256: b63fa8809564c538e9271ca06b070de989251b0a645f70e07e3c8b5db1878235
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'call of duty modern warfare nds rom' lure in the document body and embedded URLs indicates a phishing or scam attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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
  • 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://coretry.ru/pbw?utm_term=call+of+duty+modern+warfare+nds+rom
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/253686.pdf
    • https://wobajaxeme.weebly.com/uploads/1/3/4/3/134350369/dudupegagigusiz.pdf
    • https://xegiwegaravobus.weebly.com/uploads/1/3/4/0/134017761/5e1c102a.pdf
    • https://soseriwu.weebly.com/uploads/1/3/4/8/134898980/5788083.pdf
    • https://cdn-cms.f-static.net/uploads/4414867/normal_605d58d19e0f4.pdf
    • https://tenekitu.weebly.com/uploads/1/3/4/0/134018212/wuwoki.pdf
    • https://sowewazapuk.weebly.com/uploads/1/3/4/3/134364424/javepi_wizeguzonefuwo_zunurinax.pdf
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5fed69df4e713.pdf
    • https://zesukixugedun.weebly.com/uploads/1/3/4/5/134593530/ee9f936f48872.pdf
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/7930579.pdf
    • https://zagotewirapi.weebly.com/uploads/1/3/4/6/134610326/45af5.pdf
    • https://cdn-cms.f-static.net/uploads/4459057/normal_5fe7c4b5de098.pdf
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/kosakifemazukit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://moxulolo.pbworks.com/f/82045532403.pdf
    • http://jazonewu.pbworks.com/f/watson_glaser_critical_thinking_test_tips.pdf
    • http://fetinaduv.pbworks.com/w/file/fetch/145039113/54945097575.pdf
    • http://namimutigete.pbworks.com/w/file/fetch/144952365/shree_suktam_lyrics_in_sanskrit.pdf
    • http://bajupuko.pbworks.com/w/file/fetch/144993159/packet_tracer_practice.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_off0000f28e.bin
7ffa70b9af491007d923545e619b7102ad8a4bd5b089ef4afa30b977060b2a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5152 bytes
font_01_sfnt_off00010417.bin
7418d80215ef6e295786d9d2a5c3ee77dab64b340e48a94bccd974fdc93a1f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 11732 bytes

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