Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3181158c85620f…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 22:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b0e3efea48dcb12d089228f79ba4a1c4 SHA-1: bb2bda07b1e1590f9ac0cf562d884f272b9df92b SHA-256: 8e3181158c85620f0abb55120369b20332ea0ed9533e5da426e7ff520c113f8d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and its classification as a 'link farm on disposable hosting' strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high confidence score for maliciousness.

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://jacksth.ru/award?keyword=what+does+to+review+something+mean PDF link annotation
    • https://cdn.sqhk.co/setawigiz/3WWhPie/57576358064.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/JEjaidV/five_nights_at_freddy_s_movie_rated_r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_602e0f093be7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416144/normal_5fe3f37bb6eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5fea072cbefe6.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/97901760739.pdfIn PDF document text
    • http://baykamif.space/judiwuwubepumesurufififf9xg.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/VjgvMjb/free_mobile_phone_wallpapers_and_themes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_601027fdd14b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_6030316c67a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_6034300390903.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/farmall_h_carburetor_parts_list.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/xing_yi_quan_fighting_style.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447107/normal_6011e52dd0bd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/best_smart_board_for_classroom_in_india.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/internal_combustion_engines_applied_thermosciences_3rd_edition.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5372 bytes
SHA-256: d3520423bfd60a0300fdbf60de4418a478bfbe5683ebf6eebd87999f9d211f48
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 13852 bytes
SHA-256: 05140e1c9b5b57146b4baca85d66dbe39ade10e15989f3fd9d30a86ad714aa45

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