Malicious PDF — malware analysis report

Static analysis result for SHA-256 73279d3eb6d66cec…

MALICIOUS

PDF

78.1 KB Created: 2021-04-05 14:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e49fe50ce4c8138b4cf71f358a9a698f SHA-1: dcf61cba5ee31aa0e9adb6f11eae097c60ef3d7a SHA-256: 73279d3eb6d66cecb4df507c6b7eb468096d536ca95ad4803e72dcf97646e665
206 Risk Score

Malware Insights

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

This PDF document impersonates a cloud document lure, directing users to a large farm of external links, many of which are likely malicious or phishing-related. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and numerous external links suggest it's designed to lead users to malicious websites or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://zajinet.ru/strik?utm_term=can+you+get+microsoft+access+for+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fe22a3f65698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_603ee26bd70d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_604ee334311ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_6055c031a133c.pdfIn PDF document text
    • http://itrom.fun/is_will_solace_in_trials_of_apolloc26ba.pdfIn PDF document text
    • http://helplnstagramoffice.com/is_call_of_duty_on_ps5xgqwc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_605c3b689e456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_6060cfd5a933d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469105/normal_5fc68a53148ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5fe865828a9de.pdfIn PDF document text
    • http://mandarins.space/hebrew_pictograph_bible6lflz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5fc7cb21644e2.pdfIn PDF document text
    • http://nexatup.iblogger.org/nopoge.pdfIn PDF document text
    • http://kmikaerfs.ru/subesedimelekipepozasokmtclc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_6027d9209fb0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_602ddf9779642.pdfIn PDF document text
    • http://uscreditcheck.info/kalibuvobegibewijet1kqv0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_603b8a350c442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5fd344b18c603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_60568a13af5ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_c95237a2a1424447b4748aa4d881ca28.pdf?index=trueIn PDF document text
    • http://waviwonagasa.epizy.com/farinajojipulo.pdfIn PDF document text
    • http://pabenikazugaj.rf.gd/bafenunasavovaz.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_c88041426068488f891c2415ed1f2405.pdf?index=trueIn 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_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 5176 bytes
SHA-256: b919b9951edf9625fff783e9e9fcc7e656450e611dae3e43e2d39579f2985c10
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 11492 bytes
SHA-256: 4d543568f429624d69153beedf7c82bf8e80b9a524300898c36cba9cb527b779