Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5fbc6651040289…

MALICIOUS

PDF

73.4 KB Created: 2021-03-24 04:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d4178a4e00d5eb3a3647864759055f39 SHA-1: 2923d21ec8bc7faa90f4413046ff36d0f0c25918 SHA-256: cc5fbc6651040289cfbf172a814f9ac013f6717e3cd8754342470504cd1e580d
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 heuristic firings point to the PDF acting as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to potentially malicious sites for phishing or malware delivery.

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://leonvi.ru/123?utm_term=world+map+continents+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5feba2776a0fe.pdfIn PDF document text
    • https://cdn.sqhk.co/tezejikibus/gZheTic/run_rate_synergies.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/idZifTz/fimamopetodutozufuj.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/51950918100.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/how_to_calculate_the_moles_of_each_element_in_a_compound.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_5fe7f594d32af.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/AyiihhZ/vudonorolegovakuno.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/the_riveras_season_1_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/QgjM0jd/55272399285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_6041a56e80f1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuroruwe.myartsonline.com/12_cranial_nerves_and_function.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/atomic_structure_test_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/ionic_compounds_with_polyatomic_ions_answers.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/access_point_vs_router.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/gorenipasuzime.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/3004415675.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_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 5312 bytes
SHA-256: ef35c8ee487de0eb3bb39de085e2aba4668fc9c72464eb92d1bd9f00a4d96fae
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10744 bytes
SHA-256: a3aae99f77f7b64172e94dbec3ea13646d4ddac4b1eb392f511c9bf1edc1af1b

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