Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee66a285c483bd6…

MALICIOUS

PDF

70.3 KB Created: 2021-02-13 23:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d2bb9eb7f65549c5b3bfe6733da14415 SHA-1: b372329452b39502cfd799e21dd1fb6aff29bd71 SHA-256: 8ee66a285c483bd646f562ca1a59de3aaf90fa0aba75ab8a6df6d57541bc5fcf
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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

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://maypoin.ru/123?utm_term=garcinia+cambogia+cleanse+dr+oz+video PDF link annotation
    • http://1fps.ru/annapurna_base_camp_trek_no_guidesjyg9.pdfIn PDF document text
    • http://varietystore.website/pavazixojev69fj.pdfIn PDF document text
    • http://sparzha.club/zujaripigunakelisintsq0.pdfIn PDF document text
    • http://feedbacrnz.space/fasinokanuwaxidodasnjhq.pdfIn PDF document text
    • http://skameyki.club/55969641940kzf84.pdfIn PDF document text
    • http://keepxufi.space/duvujafh0ais.pdfIn PDF document text
    • http://praktika-ingenieur.com/zokobatudekoloruvfxhts.pdfIn PDF document text
    • http://lakshmi-store.ru/ice_cream_maker_recipes_with_condensed_milk6tlq2.pdfIn PDF document text
    • http://austritkfa.com/76117542568ljdlk.pdfIn PDF document text
    • http://detonicro.website/the_civil_war_in_russia_was_betweeniw3qb.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/64947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/5th_grade_graduation_speech_template.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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 5540 bytes
SHA-256: b79a913151da0f6faed1c06a21b74cc56534a4aba3e53a9872de205ac44f420b
font_01_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 10584 bytes
SHA-256: e122481322c597c628f18bb9453953311130f8e6859a53fc1e44a569cc233fe1

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