Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faf1356ae2d8824…

MALICIOUS

PDF

65.5 KB Created: 2021-02-05 05:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2f0e9e550bacfd6a955972fcef78f623 SHA-1: 89290a36105fa66b43e11f6343a4b73a7ead7e5b SHA-256: 5faf1356ae2d8824ed0814b8ae4cfd837a71ed262b8643586b1ac6a5a36de85b
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 or trojan variant. It contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect the user to potentially harmful websites for further exploitation or credential harvesting.

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/wb?keyword=bhojpuri%20song%20superhit PDF link annotation
    • http://circus.market/age_of_z_game_cheatskqctc.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/tufoguzagezuolngq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5fd28d242cc1e.pdfIn PDF document text
    • http://idealica-italiaofficial.site/that_70s_show_episode_list_and_descriptionc8gfe.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/fudebinumogume-gusekesiga-zoxixabo-makinozi.pdfIn PDF document text
    • http://bio-ita.fun/98764904374lh70z.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/kalanejaxutilif/85607856907.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/xafirunibiniruwa.pdfIn PDF document text
    • http://votojoraxu.rf.gd/noloperenegir.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/adharvam_malayalam_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/letras_bonitas_para_imprimir.pdfIn PDF document text
    • http://kagapari.rf.gd/cbse_6th_class_history_questions_and_answers.pdfIn PDF document text
    • http://lupugavediroz.rf.gd/fuvuxunogumowatevonoge.pdfIn PDF document text
    • http://vomovawesojuti.epizy.com/16439659621.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_off0000c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 4964 bytes
SHA-256: 84767ceee5936c1a37b4c1e4a1d7a27d1ee8291efcca7a19e01f17734dd944a5
font_01_sfnt_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 10520 bytes
SHA-256: 53ed678bc1e21ea5a81aa94c620229ced056791d813c47d6a9c807d731859fb6

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