Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67f0cb5a550c0cf…

MALICIOUS

PDF

72.1 KB Created: 2021-03-01 12:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d879701493391f7e5239b94560366e25 SHA-1: 8e69db1efd737738ca1bbc0b60c4d8dc9a4c8ce5 SHA-256: c67f0cb5a550c0cf06268fc567e40e62d27467a73f4845c07abc9f0099c91d05
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to product replacement, suggesting a pretext for the malicious links.

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://seumenha.ru/award?keyword=dell+optiplex+9020+power+supply+replacement PDF link annotation
    • http://barajofa.mywebcommunity.org/sat_practice_test_2_answers_scoring.pdfIn PDF document text
    • http://getsol.xyz/pupokamivozajebuszxfjc.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/ggZibgi/911_highway_emergency_rescue_game_for_android.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/botod.pdfIn PDF document text
    • http://optarfes.com/wufinufy1tg.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/polotuv.pdfIn PDF document text
    • http://trackengine.host/73740877467emlqy.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/transformational_leadership_in_nursing_journal_articles.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/b6c712e74903c.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/twilight_breaking_dawn_part_2_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/NZsgdj8/tamil_christian_songs_mp3_audio_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobikinos.onlinewebshop.net/92203356238.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/cisco_sg300_default_setup.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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 5768 bytes
SHA-256: 59e44721fb07ddc022e5f99c3521bb3121dde2e7aa4b80b8a870f2f8aa930f3c
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10428 bytes
SHA-256: db7806d62fbc6ec6c9611569c60d875c0daaf2eb674f16171704a4585b80f42e

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