Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85566ebc854a214…

MALICIOUS

PDF

68.7 KB Created: 2021-02-18 17:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 042321f185eac68e43f92d96a1a8f2e2 SHA-1: 8b7d6e3682cfb413b8f60a6846dca3417ad3a555 SHA-256: f85566ebc854a214e902e99f0c1fec5abe292138adbf8e73b7051ab93f1e1147
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a link farm designed to host PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/wb?keyword=how%20to%20find%20the%20area%20of%20compound%20shapes%20worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5fe5e1486c613.pdfIn PDF document text
    • http://maximizator.space/77141035647eeckj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5ffd693a3e66a.pdfIn PDF document text
    • http://trudogoliya.online/skylight_david_hare_sparknoteskslx3.pdfIn PDF document text
    • http://belixawotid.66ghz.com/cantonment_railway_station_back_gate_platform.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fccff68765dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fe278c3254dd.pdfIn PDF document text
    • https://votilolezin.weebly.com/uploads/1/3/4/3/134307270/2864786.pdfIn PDF document text
    • http://bonusiotsbera.online/hoop_stack_level_753n8jeq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_602189f56d317.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fddd3b301e6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwatomugexove.epizy.com/the_shroudbreaker_sea_of_thieves_guide.pdfIn PDF document text
    • http://bimitev.epizy.com/oh_baby_song_free_2019.pdfIn PDF document text
    • http://romugonixop.rf.gd/xeduletalekubevetijuz.pdfIn PDF document text
    • http://gitogopafo.epizy.com/86072038906.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/totem_warrior_barbarian_5e_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 5480 bytes
SHA-256: f26450e9dc119ffa5b9b55d55daa5f36e49e4c4e529e841e6d40b0d508069fbb
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10340 bytes
SHA-256: de0bc506dcc92791ab4d8f9226711c008c85f91f1f7b2416f127bc731bf177a1

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