Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f016c7a6b0ed2c0…

MALICIOUS

PDF

77.0 KB Created: 2021-05-07 03:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d10022e3dabe1025877f7dc48a5a310 SHA-1: dd3d00df60bbc5c96712d2bcaa96b3543006cc03 SHA-256: 2f016c7a6b0ed2c0a82c2ede483863997d02eb7d9622b3ffa0ab89b257203e09
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. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external link farm are common tactics for initial compromise.

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://lozipotod.ru/strik?utm_term=delonghi+space+heater+recall
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/xipaw_mubapukib_mapafabimule_lugalu.pdf
    • http://gitulozoripuk.22web.org/65312055521.pdf
    • https://bijararavi.weebly.com/uploads/1/3/4/5/134587429/2428792.pdf
    • https://muxudopigudud.weebly.com/uploads/1/3/4/4/134490596/20e84c.pdf
    • http://uscarins.info/debufufemutu84h.pdf
    • https://cdn-cms.f-static.net/uploads/4487927/normal_60579b2f889b7.pdf
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/dafupujama.pdf
    • http://lnstgramhelpcopyright.com/75348463221tbbrd.pdf
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/kenunabu.pdf
    • https://static.s123-cdn-static.com/uploads/4423715/normal_6007e3f1c9eb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_cec5427e96304ebeae8a94bf375aabb5.pdf?index=true
    • https://s3.amazonaws.com/jifedefujodu/2689377049.pdf
    • http://zidimuzizofobe.rf.gd/labejeguxopuvumakekeja.pdf
    • https://s3.amazonaws.com/lurutopobi/gigurujalosilaper.pdf
    • https://s3.amazonaws.com/nigimul/nidusunenemite.pdf
    • https://s3.amazonaws.com/nitajosasa/45120739304.pdf
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_6c752d9ba3ad43ab986e53207c6d9305.pdf?index=true
    • http://xoxobesoxiti.epizy.com/60491523927.pdf
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_183dc59453da430c906dbbd9f814232b.pdf?index=true
    • 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_off0000eff6.bin
87722fabd1ab4aa7f8657c1d2a488b7ddf4e0b66c3a9302a4af05eed0ee3d704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5196 bytes
font_01_sfnt_off000101a2.bin
f337d5e8a720a13a9cec0bcd475b41364643aa0f3e56a4291e3adcb30556fe11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 10968 bytes

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