Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5e6aad807347e0…

MALICIOUS

PDF

75.7 KB Created: 2021-04-04 01:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e596dcfc95c92fd21dd0583ffc7c26 SHA-1: 697123b2b46be5e0623f84c46bccc2ec359586e8 SHA-256: bf5e6aad807347e0848a4e1ab65478e8ede694badf6bafebb144afbe11375fe0
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 of which are disguised as search results for game cheats, indicating a link farm for SEO manipulation or malware distribution. ClamAV and ML classifiers strongly indicate maliciousness, specifically as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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://mezovuduw.ru/wix?keyword=simcity+buildit+cheat+no+survey+download
    • http://buzatukati.iblogger.org/pradhan_mantri_awas_yojana_list_2020_assam.pdf
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/vegav.pdf
    • https://cdn-cms.f-static.net/uploads/4425910/normal_5fd22a3e20c5f.pdf
    • https://cdn.sqhk.co/fejukomus/pgfijgf/dictionary_append_swift.pdf
    • https://cdn-cms.f-static.net/uploads/4373281/normal_604d1a6cd3373.pdf
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fcd0ec98ed1f.pdf
    • https://cdn.sqhk.co/mapelimujeku/d1jhiia/spider_solitaire_app.pdf
    • http://kepukarob.sportsontheweb.net/blastocystis_hominis_traitement.pdf
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fea46fb395df.pdf
    • http://sokepazetovul.22web.org/writing_prompts_for_2nd_grade_worksheets.pdf
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5fdd4524492a0.pdf
    • https://cdn.sqhk.co/gofejenizew/3hhuijK/6624270218.pdf
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5fd7df7fd3c8b.pdf
    • https://cdn.sqhk.co/tanusulirava/jS7bij8/zixutusol.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6016d0fb26f58.pdf
    • https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/levavozaf.pdf
    • https://cdn.sqhk.co/fogobewataja/ghNhbGu/puwexowakojefiwuwefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wufagezigedo.onlinewebshop.net/10643670847.pdf
    • http://xujerowuwabet.epizy.com/dowimopujejotivimej.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_off0000eafd.bin
55be8363d8151a1589e2296a3015aa44a2aa19dabab089f2f779117f79d2ec9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5676 bytes
font_01_sfnt_off0000fe2f.bin
f5b2e404758fe69f6bfd13b17ec813740b0b7bccd6cdef206eae1ccbec800d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 10336 bytes

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