Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e76ad5b833de45…

MALICIOUS

PDF

66.5 KB Created: 2021-02-20 10:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 949d6a55164efedb6e69bfffcae49240 SHA-1: 333a5e85617f352575cdf2634162fc4bd1b9559c SHA-256: 13e76ad5b833de4521bcd6a32368aeab0484be89e591d082fb47a9b4dc44ea01
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of external URIs and the link farm heuristic indicate a primary function of redirecting users to potentially harmful sites.

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://seumenha.ru/strik?utm_term=trials+of+apollo+series+paperback PDF link annotation
    • https://cdn.sqhk.co/zunesunatiri/Khbhagi/microsoft_teams_app_not_working_windows_7.pdfIn PDF document text
    • http://halfraire.xyz/pisosewuwrnpu.pdfIn PDF document text
    • http://bionatur.space/vebowekn7j9l.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/gijjge6/civilization_3_expansiones.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/cMicgca/bike_racing_3d_game_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_602b7ccf4ab07.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/Bshdxib/murebigukanezekenawa.pdfIn PDF document text
    • http://5gusevshop.space/labipejadf2ms.pdfIn PDF document text
    • http://madamzero.com/janiwefagkag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_601910803b5d7.pdfIn PDF document text
    • http://p-kavkaza.ru/how_far_was_tarshish_from_nineveh8vmry.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jjPietI/jevusibore.pdfIn PDF document text
    • https://cdn.sqhk.co/segexiji/R7hajfi/xadosizupejatavebirupujag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_5fe9d250b38ed.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/hiibric/20202067099.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/toguvaju/golden_sun_djinn_location_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/fogiluforufufexis.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/mizasomoxokiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/comments_in_css_sheet.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_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 5160 bytes
SHA-256: 58810a1f60a89f442db05ebcfc544932654e35cc2f1fc8849dd0ef2312b89822
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10432 bytes
SHA-256: d87b4b40a0e471c693dca4ab7b05ceb296e89ecb6994cc604fccd3adf804adcc

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