Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4e53827076c429…

MALICIOUS

PDF

75.0 KB Created: 2021-06-09 20:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 924f26447fe9bc1046b381d3fa0c2eef SHA-1: 575c301c67202391b11d62a73a4425b99f3f45a9 SHA-256: dd4e53827076c42992ea5a17defbb9d6440fc81d797df253fcd58bea8f2fcc1e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary focus on redirecting users to `philabc.ru`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` suggests the document is designed to host many links, likely for SEO manipulation or to distribute malicious content across multiple domains. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/pbw?utm_term=best+free+music+streaming+app+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fd176fc867d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_60bca4f122595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fd21945e5b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_60b8ba2251aa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ffd341b93fb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372399/normal_60088f8fed884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_6032f8ed128a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_6044927a4aead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5fdc09c16120a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5ff1ec6c3c030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fe402de5098d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_6035d86be9846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144454053/how_to_use_audio_technica_turntable.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/what_does_favorite_color_yellow_mean.pdfIn PDF document text
    • http://mosijiv.pbworks.com/w/file/fetch/144714756/pagexe.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/teenage_mutant_ninja_turtles_1987_season_2_episode_3.pdfIn PDF document text
    • http://tanoroxamo.pbworks.com/f/didapodarububefobaz.pdfIn PDF document text
    • http://gizonokape.pbworks.com/f/woxufezesuve.pdfIn PDF document text
    • http://laxujaju.pbworks.com/w/file/fetch/144750363/renupodar.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/f/clinical_chemistry_bishop_download.pdfIn PDF document text
    • http://lumoxag.pbworks.com/f/what_is_the_cost_to_hang_drywall_per_sheet.pdfIn PDF document text
    • http://nusometa.pbworks.com/f/56148525995.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144557892/jivizofoxelesizedame.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144424611/15159236357.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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 5492 bytes
SHA-256: be7f58edd78422708e14e9788c5fa54c5fbdb2fdc4aaf72fe927c32a2affed58
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 10144 bytes
SHA-256: e5b2bd586bdf25304e437685d3736e7b9bba755b5c1820d51d3ae2dd99641a0a