Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64eac0e1bfcef63…

MALICIOUS

PDF

83.0 KB Created: 2021-02-28 19:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c561a1b92b11c6e936694f5404a905c SHA-1: 767d52691d9fbc16bffe308a6061ada734ee772f SHA-256: a64eac0e1bfcef63faf5ec64ffb3bc05b624a44b44f82ec29466900c688e4ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary function appears to be directing users to a multitude of other PDF files hosted across various domains, likely for SEO manipulation or to serve as a distribution point for 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://soxebez.ru/123?utm_term=which+of+the+following+statements+concerning+evidence+is+true
    • https://gawinesiti.weebly.com/uploads/1/3/5/3/135383431/a6e316.pdf
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fd0555d7efd0.pdf
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/936237.pdf
    • https://cdn-cms.f-static.net/uploads/4377679/normal_601f3c451f3d0.pdf
    • https://cdn-cms.f-static.net/uploads/4447434/normal_60163a522eb35.pdf
    • https://static.s123-cdn-static.com/uploads/4413226/normal_5fed0c76290af.pdf
    • https://cdn.sqhk.co/kulobibab/hj9Ngex/dwight_schrute_gif_thank_you.pdf
    • http://rejuxipo.iblogger.org/47977751633.pdf
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/zanubeforela-wilowiviminilig-resapu.pdf
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fe17dca694ea.pdf
    • https://cdn-cms.f-static.net/uploads/4366311/normal_600c41940438f.pdf
    • https://cdn.sqhk.co/puxolika/cjjChf4/98619653175.pdf
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fd66b7b5a742.pdf
    • https://cdn-cms.f-static.net/uploads/4409238/normal_6030ed249a20f.pdf
    • https://cdn.sqhk.co/lizuxutagisu/hfCRheO/jipikasodereboke.pdf
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fdb71f70b789.pdf
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/telil.pdf
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/028db51806c41.pdf
    • https://xufudigu.weebly.com/uploads/1/3/4/5/134515134/pojajegudemekasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vovexibixi.rf.gd/5._1_polygon_sum_conjecture_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f4.bin
9e1b4172d96fcfc3a366a8ba9933750bc8587f0732646442c5ae1755665be775		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 5480 bytes
font_01_sfnt_off00010c7e.bin
63614cfcdc2dd07838887e57e200d66167a77c07af48fee61cdbe4767fd1a06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10436 bytes
font_02_sfnt_off00013003.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 4324 bytes

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