Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb9e930a082176a…

MALICIOUS

PDF

83.7 KB Created: 2021-04-30 17:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b703ffe52914972eacc453614524386a SHA-1: 2e38dac2744fa10418dad4c9abc306cf4cbee1f9 SHA-256: 2fb9e930a082176ae3f208a7b94a0a0e03f44d0e49f38e65e5d994b33f171cd7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on link farms, indicating a potential SEO manipulation or content distribution scheme. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

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://resalured.ru/strik?utm_term=crossfit+workouts+no+equipment+pdf
    • https://cdn.sqhk.co/kosojilufut/jbggnhf/zanabofod.pdf
    • https://cdn.sqhk.co/xulawajikigi/gfhj3he/knight_brawl_online.pdf
    • https://cdn.sqhk.co/suxupijisajo/chgijbX/99039769547.pdf
    • https://nabovuguxobe.weebly.com/uploads/1/3/1/8/131871891/latet_riroj_bobeletowudevox.pdf
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/xetigo_tigigaxana.pdf
    • https://cdn-cms.f-static.net/uploads/4421208/normal_6058f6be0c1fa.pdf
    • https://cdn.sqhk.co/xutujipux/bwmJ5ig/best_love_ringtones_2020_in_telugu.pdf
    • https://cdn.sqhk.co/vexapalas/nNhj4jh/caravan_palace_miracle.pdf
    • https://cdn.sqhk.co/gefeloxo/blgdrga/t-_mobile_digits_spying.pdf
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/ae4b72bbd.pdf
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/6082504.pdf
    • https://cdn.sqhk.co/toromerepowa/ih7ieji/64520408466.pdf
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/bogarajakip.pdf
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/1358283.pdf
    • https://cdn-cms.f-static.net/uploads/4476273/normal_600b4c0cdaf9f.pdf
    • https://cdn.sqhk.co/napotani/jwgK0qu/debrief_form_template.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fikuvine/double_line_graph_worksheets_7th_grade.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/basak.pdf
    • https://s3.amazonaws.com/widofafane/what_is_feng_shui_room.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_off00010b2d.bin
b058d4e62308026731c2c48ee8010a0b7cefd0907244445d65efa240fea8849c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 5132 bytes
font_01_sfnt_off00011ca6.bin
1d9c2c3581f5c76fedd40cb85ab36d4d6c8474a222856287d77a4575850d939c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 10752 bytes

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