Malicious PDF — malware analysis report

Static analysis result for SHA-256 b533d7528f6f4774…

MALICIOUS

PDF

89.7 KB Created: 2021-05-23 08:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f9ef696a32bc04ab8222a7d94a13b75b SHA-1: 803fe1172c0773a5b877ed76f5520af1a372c6a6 SHA-256: b533d7528f6f4774ddf2815e0d3093b33c34c8323cb718cb7ed31dc46fbc74a6
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to 'golowaki.ru', which is likely part of a phishing or malicious redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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://golowaki.ru/strik?utm_term=a+better+way+to+manage+conflicts+in+the+workplace PDF link annotation
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/ganupow-rusel-davuvekum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447096/normal_6000d9db18c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fcfa2ec7f750.pdfIn PDF document text
    • https://botefajom.weebly.com/uploads/1/3/4/6/134690565/govexanefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_6026f667313d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_5fe95a3711970.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/gutufiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_5fe635dab39df.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/guvan-sajokiraxok-kupowex-gaponaxodovenin.pdfIn PDF document text
    • https://purajibimevu.weebly.com/uploads/1/3/4/6/134652176/sovigadusovuvo.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/letijiganerupozeve.pdfIn PDF document text
    • https://ruxibini.weebly.com/uploads/1/3/2/6/132680870/5893080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fe3c224c190d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_603bc2d3349c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383334/normal_5fee37a930c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391340/normal_60164bb0f30da.pdfIn PDF document text
    • https://kaxapajitab.weebly.com/uploads/1/3/4/8/134896246/6632024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sifawekujiki/83119204028.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/buzesetasojenududatu.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/70305229547.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/fortnitemares_challenges_cheat_sheet_part_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56bc212e-0ca7-4ab1-81d6-42d4b31f14f6/zoom_5341j_spectrum.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/barrett_s_esophagus_guidelines_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950303bb-38eb-4772-be28-65cf0d279df9/49585161304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2e6a9d-8b2c-4abc-8585-58a96fee1a90/32716149350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034e31f9-0103-4382-8a6e-5a12cd0ab2ff/the_secret_life_of_pets_2_full_movie_watch_online_movierulz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 5604 bytes
SHA-256: 3f13272c183058dabfd01e096fb2215e8b6c225d1b480e1e9fc5ac7c396698e3
font_01_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 10316 bytes
SHA-256: 71d69d05822409378d492c696c34213cd4df7143c0d462abecdf40b2de68ebbb
font_02_sfnt_off00014a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34