Malicious PDF — malware analysis report

Static analysis result for SHA-256 309c4a6a76374769…

MALICIOUS

PDF

80.3 KB Created: 2021-03-14 10:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5a0a1264a1a1c2afd3668380207130fa SHA-1: ece866847b0f19817386172c7ad8fd0f59892392 SHA-256: 309c4a6a7637476955a19fe5c94870ddcf948e1f3393f9ea00a2dba6fb0e861e
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. Additional heuristics indicate the PDF is part of a link farm hosted on disposable infrastructure, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the nature of the redirector and link farm points towards an attempt to lure users to malicious content, likely involving JavaScript execution on the landing page.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=dynamic+stretching+for+golf+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_604d8da7dfa73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_60256e7f25d67.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/53518843382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fdc7ec962810.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/gupap.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/ca04d32cce6c7c4.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/best_app_to_convert_webpage_to.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe1739448573.pdfIn PDF document text
    • https://mivojunap.weebly.com/uploads/1/3/4/7/134720575/bafabinetejagitojej.pdfIn PDF document text
    • https://pagununida.weebly.com/uploads/1/3/4/8/134861868/mivoxukobadud.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/korg_microkorg_xl_plus_black.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/2497979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimuxexud.epizy.com/29287599714.pdfIn PDF document text
    • http://wurudoxozu.rf.gd/doxoxibavapasin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb6c540-cbe5-465b-a0ed-658acc16fa2d/diablo_3_season_22_crusader_roland_build.pdfIn PDF document text
    • http://wasizematimom.rf.gd/how_to_get_android_21_fighterz.pdfIn PDF document text
    • http://wegorabeg.atwebpages.com/64081221391.pdfIn PDF document text
    • http://sigebetomisokuj.epizy.com/prohibido_enamorarse_de_adam_walker_saga_descargar.pdfIn PDF document text
    • http://lipubumili.epizy.com/change_of_address_letter_format_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144378e4-c06d-4677-9a87-f2ed691caf5d/tubilovupimafoditazezod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a3e43d-2943-4793-8ecf-35efce0e311e/bose_901_speakers_vintage.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_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 5672 bytes
SHA-256: 6b8f1b5b72e75da74b6772cbb9f1cdef15545af85b639fb5f1367a42edbd62e0
font_01_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 10424 bytes
SHA-256: e30cbb8dab938feabce88523425819eb62544a43bb2c0e59bf60468ab2e2ffb1

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