Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb37cb3ee0790790…

MALICIOUS

PDF

105.0 KB Created: 2021-03-02 16:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4638107aca6f6bf02e34bd04c5bda0e7 SHA-1: 442f3e1a0b51d9d0b0b3ff9d0df58f2f9f47a2fa SHA-256: fb37cb3ee07907908b32939fc26208aa61af5e45d7c5c4dfb33a44e98cb48cb3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'Socratic questioning examples in therapy' and the wkhtmltopdf application, suggesting a lure. Numerous external URLs are embedded, with one specifically identified as a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme.

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://fokemale.ru/award?keyword=socratic+questioning+examples+in+therapy PDF link annotation
    • https://cdn.sqhk.co/fidasawon/Jhciahe/katejinifup.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/hgjewhi/modern_disney_princess_dress_up_games_online.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/maze_runner_2_full_movie_online_free.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/xebomo.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/tabla_de_verbos_didacticos_de_la_taxonomia_de_bloom.pdfIn PDF document text
    • https://vutuzanepe.weebly.com/uploads/1/3/1/4/131453188/4412091.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/Is5jfie/best_guide_for_among_us_10_players.pdfIn PDF document text
    • https://cdn.sqhk.co/babakobesuxe/ggjjie0/teppen_card_game_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibiwoziveva.epizy.com/carry_on_jatta_2_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/4852577321.pdfIn PDF document text
    • http://farodagepuwo.epizy.com/49870405768.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/mickey_mouse_cartoon_german_flag.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/does_2006_honda_civic_have_timing_belt.pdfIn PDF document text
    • http://gijuvaginitawaz.epizy.com/jibepu.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/31573096882.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/fibijinurulimed.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_off0001602c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602C 5748 bytes
SHA-256: b32d8b612f3da60f414b83cd48eccd981d2a823765d3df2755fb545dcd3cedcd
font_01_sfnt_off000173a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A2 10272 bytes
SHA-256: b75ad3c4f800bcfbdfc207ca5a5cf6787163b11fc26d08cb984a6b111bcf8c49

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