Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea8dc39fd86f3eb…

MALICIOUS

PDF

74.6 KB Created: 2021-06-12 13:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f60f60dd9b14c94fc3d4f8cbf8cfb7ad SHA-1: 05e722a0a0eb3fd958b5b3eb613f81ff130af4b9 SHA-256: 9ea8dc39fd86f3eb5b1685f7f08f7bcf4789c39bbbab50fcdbe56b5cb0b84285
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that aligns with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/pbw?utm_term=nat+type+glitch+gta PDF link annotation
    • https://bunemanedadon.weebly.com/uploads/1/3/4/4/134476229/1051298.pdfIn PDF document text
    • https://gigotuvo.weebly.com/uploads/1/3/1/1/131164366/b49607679ac4b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_603b4c5ff352b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_604a5eb1bc800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_605cb583f32bd.pdfIn PDF document text
    • https://tetulivul.weebly.com/uploads/1/3/4/4/134401277/c9bb70835.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/726d5f23c5e645.pdfIn PDF document text
    • https://gudozegibuxof.weebly.com/uploads/1/3/4/7/134732985/tarot.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/fevapafesemasewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5ffbbfc011331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144624951/97061716158.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144532725/what_type_of_intermolecular_forces_does_methanol_have.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/bazagizowefi.pdfIn PDF document text
    • http://nimojugaf.pbworks.com/w/file/fetch/145184199/vixatizopowujelafe.pdfIn PDF document text
    • http://favixose.pbworks.com/f/tukegu.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/gamecube_and_wii_roms_for_dolphin_emulator.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144591549/ejercicios_morfemas_flexivos_y_derivativos_6_primaria.pdfIn PDF document text
    • http://dokadeku.pbworks.com/f/22992035040.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/autentico_1_spanish_workbook_answers.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144741789/keminekajojijukogefasu.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/pirasa.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/145183245/lakugedi.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144513615/64947100260.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_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 4992 bytes
SHA-256: e184752f47fd1e293fdeb1093d847aefe27766ccea4c3eda35859829a418a9f1
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 11964 bytes
SHA-256: 616b9a1857609bccbdc67da1f4e2ccf327cee35273740e3c2efeb949165f0e6a

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