Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89f2c651230877e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 03:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 708f2cdf6440d6a4626c38cbeeb3bd1f SHA-1: cfbc122220f50aaf09fd1f90ad70186a102e5ee5 SHA-256: d89f2c651230877e03fb75dc705d4384e5c55a5213f07e9a5218823a58a8d14e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=apa+citation+format+generator PDF link annotation
    • http://idealslim-italiaoficial.site/83097977626uhrh0.pdfIn PDF document text
    • http://sarhello.online/is_taco_bell_fire_sauce_keto_friendlyk423g.pdfIn PDF document text
    • http://redpandarecycling.com/ios_13_beta_installation_guide5mh6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5ff6c81e8b3e7.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/Xjfjf3d/nalor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_6052fe6285088.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/5DPBvhg/space_colony_ark_fan_art.pdfIn PDF document text
    • http://medway24.com/zuxavikap2eumk.pdfIn PDF document text
    • http://mavisuvegepufi.iblogger.org/world_time_calculator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dufikibagi/7hYPLig/25065682094.pdfIn PDF document text
    • http://wide-do.top/what_is_burning_a_patch_in_airsoft57mkv.pdfIn PDF document text
    • http://1-bog.ru/how_to_charge_ipod_shuffle_1st_generationxocj6.pdfIn PDF document text
    • http://doweryklkq.space/why_is_my_fax_machine_not_sending_faxesn16c6.pdfIn PDF document text
    • http://roskycnmx.com/11121901101bz4jr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5ba278-3a16-4f68-b79d-8900157655d0/lodanajepedudis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0119f96f-81a2-49e2-aa54-77d958a3f0a5/7804791987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9151c1e-9b25-4953-b9e5-d851bd61267f/5_importance_of_text_structure_in_academic_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0afb4a5-306e-4130-b5ef-5778a875d922/nimusexigeturoxax.pdfIn PDF document text
    • http://luzawuwu.epizy.com/worksheets_to_improve_handwriting_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77469954-2bb5-479f-9440-92570aeb4124/idylis_air_purifier_instructions.pdfIn PDF document text
    • http://zoxuleresuxenez.rf.gd/che_guevara_biography_in_english.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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 5112 bytes
SHA-256: f157396d87902c59529e846242a9c8765307bc588645568e51cc6177614624a6
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 10848 bytes
SHA-256: 2f5f7154cc7a57a62704aabde0b6f9bb79ed0d8c65d1e3625916633ba9735644

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