Malicious PDF — malware analysis report

Static analysis result for SHA-256 365a7a539110728b…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 15:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 753394e2bc5022011d9e22cf21a3796c SHA-1: 6800d950c71f47385b5af8a534c787e190683f7f SHA-256: 365a7a539110728b25892482f24c2d8f0f7ab68674990f16395d19adcec96eb5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a sales listing for a firearm, likely a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such lures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

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://jacksth.ru/award?keyword=marlin+model+81-dl-22+cal-s-l-lr+for+sale PDF link annotation
    • http://alisaborodaenko.design/95315260097rr5hq.pdfIn PDF document text
    • http://workmonster.net/cat_staring_into_space3b6wh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5fe9206e67317.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/us_navy_diver_insignia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_601ecd40c4e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_60155ac19bb4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5fd92e4561eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_6015b6584d152.pdfIn PDF document text
    • http://useraisins.pro/la_la_land_watch_free_onlinextrk0.pdfIn PDF document text
    • http://pl50off.info/54452384498u98f9.pdfIn PDF document text
    • http://gujotimizuluxos.iblogger.org/how_long_do_you_cook_sweet_potatoes_fries_in_oven.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/samsung_grand_prime_motherboard_price_in_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawidapiwixub.epizy.com/order_of_operations_worksheets_with_answers.pdfIn PDF document text
    • http://tuxusar.epizy.com/baarish_yaariyan_song_free.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/soundmax_adi_audio_driver_windows_7_64_bit.pdfIn PDF document text
    • http://vudubarexofibuf.rf.gd/43059609082.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_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 5584 bytes
SHA-256: 6e98fc833af89f22c8ff941a021a2dc41ca9aba7bcd0244ec10c67a773071770
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 10852 bytes
SHA-256: eb07f8e30a99cf33e0ba784d4e4cd42521b13c63658b4333856ea28b9366419f

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