Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85b32101541d3e1…

MALICIOUS

PDF

77.0 KB Created: 2021-04-07 10:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4d5b3eac3a436431e2213a6ee766b797 SHA-1: b6e20413e0762883808cb049832794d860c942c1 SHA-256: c85b32101541d3e1617b1534488ebbdc6d0ec32286be92d4334a1a01c9942960
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 likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence indicate a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=2020+honda+ruckus+owners+manual PDF link annotation
    • http://accueilcmb.com/did_houston_kraft_and_harley_divorcefkrs0.pdfIn PDF document text
    • http://ontrade.top/582697522301whfp.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/iahoIje/perfect_kicks_vip_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/jjlhjO3/lugunefigizasaxoratenot.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/ezb3iiY/pewaxejejok.pdfIn PDF document text
    • http://okclub.org/an_imperial_affliction_book_amazona5e8w.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/6jjjjGe/ronadedojapez.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/iiN7jjf/58135567887.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/aEPQ9Eg/descargar_empire_war_age_of_heroes_apk.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/47939451456.pdfIn PDF document text
    • http://hdsamara.ru/35064924999g87w7.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/8ijQxmM/alien_space_invaders_game.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/21gjkjj/bugoleguze.pdfIn PDF document text
    • http://vigastlens.xyz/17684044669kcwyz.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/d269730c-d4e7-44b3-bc56-d86eecac1371/63740315881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b081f6b6-963d-4c0e-80dd-748c28649548/how_to_restore_corrupted_data_on_ps3.pdfIn PDF document text
    • http://dijipola.onlinewebshop.net/giguxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2921e495-3212-441c-80ce-2a63db9c84d1/12956204395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8a7e08-5538-4cf0-ad66-0b8184811f9c/books_written_in_the_1900s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbe9a2d-379c-43e4-ae89-9bb9fa043d18/best_movies_like_fifty_shades_of_grey.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/garmin_map_update_free_download.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_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 5512 bytes
SHA-256: 7c79f21e364bad1170343d2c7f05a2b3ebe78809096614a7addd3f9602c12a44
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 11296 bytes
SHA-256: e429c2c96159263b106974abdb00b6811fd34ef17db6b5cb61d005624278add7

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