Malicious PDF — malware analysis report

Static analysis result for SHA-256 f679a888cb920969…

MALICIOUS

PDF

72.5 KB Created: 2021-02-16 12:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d9274841b86d45f26af8e781c11956fd SHA-1: 152f48fa272ff7a9550d6a67e9f349826009347d SHA-256: f679a888cb920969ed315c4647f24183d492ec176ff8c7db495f94f9834b9744
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, with many links on disposable hosting and UTM parameters suggesting tracking for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=amc+12a+2019+cutoff PDF link annotation
    • http://epaytds.xyz/bluetooth_dongle_driver_for_windows_7xe3bm.pdfIn PDF document text
    • http://activa-fb.com/spintires_free_download_utorrentsszvt.pdfIn PDF document text
    • https://cdn.sqhk.co/mufipofunup/jcAmojj/gitabefimidozumejidubepez.pdfIn PDF document text
    • http://igonlinesupport.com/fujogukajuzajatovi5g69w.pdfIn PDF document text
    • http://sy0n.icu/womafipidaugtjm.pdfIn PDF document text
    • http://callup.today/159700230931492k.pdfIn PDF document text
    • https://vusekuzobogurow.weebly.com/uploads/1/3/5/3/135327372/4039673.pdfIn PDF document text
    • http://eglo.club/homeopathic_medicine_materia_medica4m84s.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/vuvikizugiki.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/5514441.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/Jgigiaz/52546591920.pdfIn PDF document text
    • https://nebolizeluxofid.weebly.com/uploads/1/3/0/8/130874408/ba0de16c5.pdfIn PDF document text
    • https://cdn.sqhk.co/tulovixegoke/caThcgg/ruzazozowe.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/Uighfig/viral_videos_2020_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/foKijMm/79921322410.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/relelarizozowupotaked.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/salesforce_opportunity_forecasting_report.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/adda_247_reasoning_books_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 5192 bytes
SHA-256: 3f6062f3fe69c9cffb742f89ba38397bd01b14c24acc1def4878e9fd10e99f1b
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 11304 bytes
SHA-256: c73c92d98ab06a32c914ae5419d736ba10ba4fecc943a8cf834138ef858195d4

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