Malicious PDF — malware analysis report

Static analysis result for SHA-256 de29a3bec9554d58…

MALICIOUS

PDF

78.9 KB Created: 2021-03-30 03:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11500faeebc08e9a256ce1c55ebe7d87 SHA-1: d4264fa590c13ebc37030655e45b91ae0b7ecafa SHA-256: de29a3bec9554d5874f6b88ce60f6d299c1e2899d3daccb423d2546da177626c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain (`lozipotod.ru`) that is likely used for phishing or malware distribution. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further suggests a malicious purpose by identifying the PDF as a link farm hosted on disposable domains.

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://lozipotod.ru/strik?utm_term=is+rca+tvs+good
    • https://cdn.sqhk.co/sudidoxa/ZF5jgie/25692652512.pdf
    • https://static.s123-cdn-static.com/uploads/4375514/normal_60070ebde1f06.pdf
    • https://cdn.sqhk.co/ronutalin/f3jbggk/lake_tahoe_weather_snow_report.pdf
    • http://lnstagram-helping.live/getetepeuiyvo.pdf
    • https://cdn-cms.f-static.net/uploads/4470027/normal_601d51cb06a03.pdf
    • https://cdn.sqhk.co/noneniwetav/igTI5d0/alone_season_7_episode_1_hulu.pdf
    • http://urro-hu.com/weber_genesis_e-330_grate_size7jl4b.pdf
    • http://dress-russia.ru/sezivupadidogejv9ltr.pdf
    • http://pewekelexu.mygamesonline.org/54253202665.pdf
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fd63bf6ae27c.pdf
    • http://komamoj.22web.org/gapimota.pdf
    • https://cdn-cms.f-static.net/uploads/4427821/normal_6037977763116.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_602c763a1791a.pdf
    • http://itash.space/little_snow_white_brothers_grimm2mldx.pdf
    • https://cdn.sqhk.co/bozawenibiwa/4uCpijF/momavelusimulijaligeruka.pdf
    • http://babblescoop.store/average_machine_learning_salaryxcng4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuvuwibeguz.epizy.com/wuzikosaginejupepagix.pdf
    • http://widusop.atwebpages.com/a_propsito_de_tu_boca_jaime_lorente.pdf
    • http://wudazebej.atwebpages.com/anthony_giddens_sociology_7th_edition.pdf
    • http://tudugir.atwebpages.com/51426393765.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66f.bin
a2b545343b43f4d1e9e425287e84c9e8a58a4a6c3c49f081c841fdbb15a2b26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 5072 bytes
font_01_sfnt_off000107c5.bin
383fe51e07edd6ba201fad65fa659bff03b353293c932c6586ad2dbfcde44ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 10964 bytes

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