Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c91b21ec6f85e5f…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 07:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2fe36001eee19df778d849e3eabb9c9d SHA-1: d4d62205c01c1d11331104975e5f4657d1d50f0b SHA-256: 5c91b21ec6f85e5f86e7508a9325b5a387590d8f075a2426201dd7d0f59dbbc7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('maypoin.ru') that is likely used for distributing malware or conducting phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=the+power+of+the+powerless+quotes PDF link annotation
    • http://kenugizi.getenjoyment.net/vasaxagodesanexego.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/old_school_cars_for_sale_near_me_craigslist.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/echo_pb-250ln_carb_adjustment.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/what_is_included_in_dodge_durango_tow_package.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/aUjek0X/77802885064.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/1lghia3/how_to_play_bee_brilliant_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/Hhegcjg/daleruvonidevur.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/graco_milestone_all-in-one_car_seat_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/dell_latitude_d830_ram_replacement.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/best_smart_board_for_classroom_in_india.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/the_spell_of_the_sensuous_book.pdfIn PDF document text
    • http://gadivedu.rf.gd/filtration_apparatus_manual.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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 4948 bytes
SHA-256: 2955171996152f0c99709a3760a3980b199e7e9fde4094c8514f336acd16b52c
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 10808 bytes
SHA-256: 3986041b526da70ee3531b4c7c9dbaa640454d6b4e32d740733983608cc3e1a4

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