Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e76973687258875…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 11:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 25eb4cd2c7376c01fc4eaaf1594179a9 SHA-1: e2191325cfe2a830ddd99f455d07635f88bb1edc SHA-256: 3e76973687258875ddedad8159a9126d90dd5d57f810facc6aaca82aac05874e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the lure.

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://seumenha.ru/award?keyword=asia+cup+2020+schedule+pdf+download PDF link annotation
    • https://cdn.sqhk.co/juxefirapuf/EdRjgn3/perpanjang_sim_motor_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_604a668737354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_6037095389a3e.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/2006_chevy_equinox_heater_core_replacement_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fd1fdad294eb.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hjifjaq/minecraft_skins_with_capes_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_6008626f7e220.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/gx3gjja/slot_cars_sold_near_me.pdfIn PDF document text
    • http://kumujobu.iblogger.org/adobe_photoshop_tutorials_video_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://susebatosod.rf.gd/alesis_qs8.2_price.pdfIn PDF document text
    • http://balazetesu.epizy.com/11465402061.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/roribajinexamozugono.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/3555300549.pdfIn PDF document text
    • http://sewadereweben.epizy.com/cerebro_humano_e_suas_funes.pdfIn PDF document text
    • http://davutawopoban.epizy.com/funeral_service_program_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/sinners_in_the_hands_of_an_angry_god_rhetorical_analysis_essay.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/xonexavufili.pdfIn PDF document text
    • http://zatafefot.rf.gd/jakekilomosebipulizewaboz.pdfIn PDF document text
    • http://fubegamo.epizy.com/how_to_pair_a_kenwood_rc-m1824bt.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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 5500 bytes
SHA-256: 3b0802000d0b3e3d8f26ecaf43bd535e601a0e6b8fe7fcc3705ab04eb055be97
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 11656 bytes
SHA-256: 909920660b79df2cc7a6ae6d8e4c71cf4a76345d8afd11211f8af9e929cac0ca

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