Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ff280251096beb…

MALICIOUS

PDF

75.1 KB Created: 2021-03-10 12:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e736f32eb906183b32545d36cf7de155 SHA-1: 9bc597c43fe73337db9a092fa37c236b8d020a92 SHA-256: b4ff280251096beb07abb956b91d14b19a44572dd06fa4f643d254dd5562e686
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and acting as a link farm, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the 'link farm' heuristic suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/aws?utm_term=fitbit+flex+2+for+sale+near+me PDF link annotation
    • http://ejqy.com/76033081406k51r9.pdfIn PDF document text
    • http://pokypka.xyz/alienware_aurora_r7_service_manualbcr35.pdfIn PDF document text
    • https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/kivobiguwabada.pdfIn PDF document text
    • https://vobelorigod.weebly.com/uploads/1/3/4/0/134096073/womamis.pdfIn PDF document text
    • http://instahelpforbusiness.com/69642408028k702t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6015713890d35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5fc87b8d78712.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/61e55.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/malazaj_wegaxasorub_logom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fd5ff70e2a84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fdda97-adf1-4f76-ac64-e45fc4a4eb30/wisakunerimif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3bfe3b-87bc-448d-9507-cd3757962990/wooldridge_econometrics_5th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/jivalozemeboxapetalalik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60455293-d574-4b73-9772-174f6a9eaa44/guxevujubegadikijefakirox.pdfIn PDF document text
    • http://bibuligo.epizy.com/pandora_cracked_ipa.pdfIn PDF document text
    • http://vuzoziwulof.epizy.com/86168847561.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/fazejiwa.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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 5208 bytes
SHA-256: 24309040108a987db80dc872d3ac3fcd37cd68e802546da5379a730ab4c2d77b
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 10004 bytes
SHA-256: 1d88a7895202051376e20143f2de8118cc96bd4f0cefd2f3d4e2f0d99faca5bc

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