Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d6281785cb66b…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 21:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e6c35da7dee705e727863fd883f84a35 SHA-1: b184a84ece136a27358e330f366ad9bea15b0bb6 SHA-256: a98d6281785cb66b328d71740a9cd537b4c7a01bb2fa6c162bf22bea9541445f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'pelibifir.ru'. The document body, though heavily obfuscated, suggests a lure related to software downloads, aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of external URIs and the overall heuristic profile strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=firefox+45+portable+linux PDF link annotation
    • http://italywow.space/lulu_guided_reading_levelcmwmr.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/c_programming_objective_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_602bed5ab4f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_604d0a2984ad3.pdfIn PDF document text
    • http://tesar-krd.ru/acer_nitro_15.6_gaming_laptop_reviews4n0s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_604a109fedb6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_601abb0b1369c.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/98113780550.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/zodugoweso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_602ad3fcd0897.pdfIn PDF document text
    • http://sejojus.iblogger.org/gidevilinokijazopigadaxi.pdfIn PDF document text
    • http://kerufeki.22web.org/dujakixepofaragoruxo.pdfIn PDF document text
    • http://e-sparks.ru/buscar_informacion_sobre_el_aprendizaje_basado_en_proyectos_abp2gr20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_604819a427ed2.pdfIn PDF document text
    • http://ca-management.website/ms_dhoni_movie_in_hdy8f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fd68ca162ceb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nimuwet/ps1_emulator_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/htc_one_m8_accessories.pdfIn PDF document text
    • http://sivigowukom.epizy.com/splash_screen_example_in_androidhive.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/xusubuzutovekekolikovala.pdfIn PDF document text
    • http://niselasot.atwebpages.com/convert_decimal_numbers_to_binary.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/rogifofaxinokozunenibaner.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_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 5092 bytes
SHA-256: 6cb6462a251541b894ad9371f92c7883185b757a6a7e059fe354daa4f5ec6ace
font_01_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 11684 bytes
SHA-256: dd0f71d382921007ccb0287986421f7e8560e6dcc0b89fd043c90c5dcb584643

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