Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62834225b7d4a22…

MALICIOUS

PDF

85.9 KB Created: 2021-03-27 18:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ab8d6b9b97ced22d7322749069d8c255 SHA-1: 1b6214ef1143dd7489d79011ebdf2f6f7efae338 SHA-256: f62834225b7d4a221a09997b508d69f8a6622d228b9c7e6a02832f131bc65b04
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=birmingham+tram+map+pdf PDF link annotation
    • https://cdn.sqhk.co/wabasenenem/jhOigHP/army_fitness_program_for_civilians.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/what_is_the_best_electric_wet_dry_shaver.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/WghQM3G/92181453709.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/aDaxYjj/wooden_farm_animal_toys_for_1_year_old.pdfIn PDF document text
    • https://cdn.sqhk.co/karelevo/jaBSijm/kigowu.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/icjcHUR/mepuzomekorikufema.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/aUibgjH/ruropejoziputoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_0bbef204e507456a80e67e8ed211150e.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_be36cb211be2475c8b51c872cd9f062c.pdf?index=trueIn PDF document text
    • http://rukinozo.epizy.com/the_girl_with_the_dragon_tattoo_2018_cast.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_4995bc12d91e4b3ea806a45db9dde144.pdf?index=trueIn PDF document text
    • http://luremanoxe.epizy.com/kodaxu.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_fe885d958b134476b5bd0f87ca088271.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_f9640fba15e74568ad19a0287cbbc371.pdf?index=trueIn PDF document text
    • http://wojemegakal.rf.gd/suzaje.pdfIn PDF document text
    • http://jizuperuxe.epizy.com/adjectival_phrase_examples.pdfIn PDF document text
    • http://ditajizuru.rf.gd/beats_audio_pc_software.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_62314fbe6232431ebfedcfcba26bd799.pdf?index=trueIn 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_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 5296 bytes
SHA-256: a86cd999af9960a955282d6350f7f2cd1a248f7de92cbde0a6bd16989b0a9a22
font_01_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 11104 bytes
SHA-256: f60273c7276ce3d3fa4646b5764be3b29ebb97fd7d28aebb7d9423c57fd0ed2b

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