Malicious PDF — malware analysis report

Static analysis result for SHA-256 79872f5fd862cbda…

MALICIOUS

PDF

73.0 KB Created: 2021-01-17 17:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 42e16db6f955bd77f3b79272ba5e701c SHA-1: 51539708b38b374c38913cf6ad13de10c12dff2d SHA-256: 79872f5fd862cbda388486ea69f3b8112c97ba1716fcc7500a4e1200b68bb39c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to games and applications, likely serving as a lure.

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://trafffe.ru/123?utm_term=doors+and+rooms+escape+king+3-3 PDF link annotation
    • https://site-1175657.mozfiles.com/files/1175657/online_multiplayer_games_like_8_ball_pool.pdfIn PDF document text
    • https://wuzajamepoxomis.weebly.com/uploads/1/3/4/0/134096323/mofub_sofalizavo_jojapebaziwe_koluwunop.pdfIn PDF document text
    • https://site-1171753.mozfiles.com/files/1171753/annexure_a_form_for_passport.pdfIn PDF document text
    • https://site-1178820.mozfiles.com/files/1178820/31360731407.pdfIn PDF document text
    • https://leninopuzidami.weebly.com/uploads/1/3/4/4/134493411/4944225.pdfIn PDF document text
    • https://pidujalibogi.weebly.com/uploads/1/3/1/3/131380128/jedujozuxiz_zedokesul.pdfIn PDF document text
    • https://site-1175017.mozfiles.com/files/1175017/terudevowasubabog.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/3789648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenerunikojovo.epizy.com/call_of_duty_android_mod_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/vaxajazedapo.pdfIn PDF document text
    • http://sikofus.epizy.com/67625203984.pdfIn PDF document text
    • http://nujexaraxeb.epizy.com/515171455.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/carsguide_subaru_xv_review.pdfIn PDF document text
    • http://kurejaj.epizy.com/vidmate_video_er_2018_free.pdfIn PDF document text
    • http://jufakoxageponuz.rf.gd/69963169568.pdfIn PDF document text
    • http://mutidulofof.epizy.com/mera_bhola_bhandari_full_song.pdfIn PDF document text
    • http://pejefovad.epizy.com/we_cordially_invite_you_template.pdfIn PDF document text
    • http://zofududa.rf.gd/girl_guide_campfire_songs.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_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 5620 bytes
SHA-256: e726aad4c9adef04394f458068c426bfb99c20c57f6c4df389bbc9a934ec57fe
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10700 bytes
SHA-256: 011307c2aec521d87ae5a89ebaaf3575b3a5ecbdaf47fec3fc0f6326507c8b33

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