Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10f3203bf343b2a…

MALICIOUS

PDF

89.3 KB Created: 2021-03-25 13:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9fc19eed8e5d90af3e4962b34904dc76 SHA-1: 5a9ed29e3f97dcc4584965e9874fec0d38509a22 SHA-256: c10f3203bf343b2a8a0d6d513a6f2207715beef7d2a5b59784cd781de79f4276
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/wix?keyword=medieval+makeup+recipes PDF link annotation
    • https://cdn.sqhk.co/xisofofumew/bUjjjfh/40378825965.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/pepib.pdfIn PDF document text
    • http://trycabinets.xyz/sony_dvp-cx995v_repair4py6o.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/i_hate_you_i_love_you_piano.pdfIn PDF document text
    • http://vkrowl.com/vmware_nsx-t_reference_design_guide_2.4q6y4j.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/cambridge_advanced_english_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/MbiiO4e/fujuxovuvizadetum.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/uppababy_mesa_car_seat_strap_covers.pdfIn PDF document text
    • http://wobokegidutijem.iblogger.org/89660858519.pdfIn PDF document text
    • http://sumodena.getenjoyment.net/the_willows_algernon_blackwood_espaol.pdfIn PDF document text
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/dupozuzoxolazuw.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/d34f0cef75.pdfIn PDF document text
    • http://xezakekefeba.iblogger.org/answers_traduo_para_o_ingles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gavojomizam.epizy.com/warhammer_fantasy_bretonnia.pdfIn PDF document text
    • http://rajasoxavilal.rf.gd/around_the_world_in_60_seconds_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 5348 bytes
SHA-256: 19d31bdf21c1e84e391fb1c5f033359e9d8b3b5c3712e4d7df5781d437d1259f
font_01_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 11396 bytes
SHA-256: 20acadde570cea2ac28009a4554ec98616ee822288b4cc44239185bc301af8d1
font_02_sfnt_off00014356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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