Malicious PDF — malware analysis report

Static analysis result for SHA-256 3117a4bff271b680…

MALICIOUS

PDF

85.2 KB Created: 2021-03-14 07:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e32f6d0d3690c5e94c292ca90f65d949 SHA-1: 216ec6af2a04ebf8818172c1294e58e9e4240030 SHA-256: 3117a4bff271b6803c6b3c13fd9d08d8bddbd297c3d331d6789be1f7842c6559
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=is+killing+floor+2+cross+platform PDF link annotation
    • https://sarixibaparuve.weebly.com/uploads/1/3/4/3/134382026/85657.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/how_to_buy_a_digital_camera_for_beginners.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/what_if_it_works_movie_trailer_meaning.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/kiler.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/kemewumi-rokan-xurupawev-gizeget.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/ralelir.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_use_schumacher_battery_charger_se-82-6.pdfIn PDF document text
    • http://top-salez.site/36060693860yq3bn.pdfIn PDF document text
    • http://interplast.ru/rodepdlk6s.pdfIn PDF document text
    • http://jagofililopimum.22web.org/what_do_you_feel_when_youre_anxious.pdfIn PDF document text
    • http://sdek-24.cc/what_is_a_freshman_seminar_in_collegebkozy.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/damerirazib/komiwogopipafuwokej.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/jadud.pdfIn PDF document text
    • http://tudutov.rf.gd/que_es_destilacin_fraccionada_ejemplos.pdfIn PDF document text
    • http://kejefutipetube.epizy.com/enterprise_financial_reporting_tools.pdfIn PDF document text
    • http://zafokogilose.rf.gd/makalah_aborsi_menurut_pandangan_islam.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_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 5468 bytes
SHA-256: 37ecb7ddcc2e884db7af21011dd2746405d2d0d802a278c5caf98597a5030fcb
font_01_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 11124 bytes
SHA-256: 956707d101d5c89d8c362b9d54d47c86ab55f30ec8bfe02fdaa42f6ea4c77a42

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