Malicious PDF — malware analysis report

Static analysis result for SHA-256 912cc9f386806cdf…

MALICIOUS

PDF

144.4 KB Created: 2021-03-10 06:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 695611f80bc0d58a47d8f8dcc7be6b8e SHA-1: 31fd79c25b99588f8650745b406a169394e9dd65 SHA-256: 912cc9f386806cdf08caf9ab213d7626d9a8e7292ab30d33da96782b0044f3ec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious sites, likely for SEO manipulation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/award?keyword=brief+and+summarize+history+of+track+and+field+pdf PDF link annotation
    • https://cdn.sqhk.co/vanewano/HjiheTU/space_flight_board_game.pdfIn PDF document text
    • https://novagonuneji.weebly.com/uploads/1/3/1/4/131483078/8a95cb.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/fkhh7hc/77498887045.pdfIn PDF document text
    • http://bristol-yalta.run/walking_dead_zombie_maske10pab.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/iichgEO/margherita_turkey_pepperoni_gluten_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/OhggfU9/gegosaxukizekidojiwux.pdfIn PDF document text
    • http://lazadoso.iblogger.org/american_dream_definition.pdfIn PDF document text
    • http://jakor.pro/60762484499s7f8p.pdfIn PDF document text
    • http://perevod-card2card24.site/the_handmaids_tale_season_1_download_redditrna24.pdfIn PDF document text
    • http://adanakebap.org/966936962w7u4v.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/i_like_me_better_official_video.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/2pISk1K/25873529914.pdfIn PDF document text
    • http://copyright-supporthelp.com/59300875510zc18m.pdfIn PDF document text
    • https://gafogipew.weebly.com/uploads/1/3/4/4/134475428/bapizivuwafulokema.pdfIn PDF document text
    • http://kovopajewasenuz.iblogger.org/65449624799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewexojin.rf.gd/9379773705.pdfIn PDF document text
    • http://vexifebama.rf.gd/what_are_the_content_and_process_theories_of_motivation.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/kazofafuguvolovu.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/nijexoloj.pdfIn PDF document text
    • http://jolafefiluw.rf.gd/1879246118.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_off0001fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB3F 5660 bytes
SHA-256: 7c453bdc2164611f00d444e142c8092b966d04a20970d8234644cc54ef8653ea
font_01_sfnt_off00020e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E6D 10656 bytes
SHA-256: 7fb1738374cea57887f7446eb11c612fd4c346af53dabcf37d8a8b21ae422cd9

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