Malicious PDF — malware analysis report

Static analysis result for SHA-256 8135a9aeb2fcc2c6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-28 08:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3fb4d14a05360482047839342eebc38b SHA-1: 3f8540aa318a6fb5188e7890001502264069bb95 SHA-256: 8135a9aeb2fcc2c678e70723171e385917f5267d7807caf6fb823f59e1a084fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/award?keyword=tecnicas+de+anclaje+pnl+pdf PDF link annotation
    • http://witaxolexigabi.mywebcommunity.org/10868392411.pdfIn PDF document text
    • http://tigobari.iblogger.org/vibaxi.pdfIn PDF document text
    • http://kittyplay.online/washington_football_team_quarterbackqi2r6.pdfIn PDF document text
    • http://gojoges.iblogger.org/a_discovery_of_witches_season_2_sky_one_time.pdfIn PDF document text
    • http://goduvide.22web.org/6698515990.pdfIn PDF document text
    • http://wumofuzusagumo.22web.org/construction_risk_assessment.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/3410887.pdfIn PDF document text
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/riviwuvimumasosozowa.pdfIn PDF document text
    • http://vosalax.22web.org/life_cycle_of_non_flowering_plants_worksheet.pdfIn PDF document text
    • https://murezujal.weebly.com/uploads/1/3/5/3/135305344/96b0b98.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/zivuzureki.pdfIn PDF document text
    • http://getallcreditscores.info/julilezutosewikub9ewh1.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/woxemi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/bafakurewobudutanaxanoto.pdfIn PDF document text
    • http://kasanuvuwa.epizy.com/tedifoxuvupiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86e1a70-e983-4945-af2a-2777341bbe49/28845984680.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/zero_sort_recycling_bangor_maine.pdfIn PDF document text
    • http://widuwuzal.rf.gd/50024609579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67090256-fcf0-43bd-8797-175e48d4312a/wf_2630_refillable_ink_cartridges.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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 5080 bytes
SHA-256: 8bac4c02ef325bac38c23c6577090af554ba6aaf7ea1bd31395990f597cc1957
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 12196 bytes
SHA-256: cb4e212394ebc46e16854c882c93223c94aab61fb9c57f99bcf670cc41b26364