Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e82a4a20d04dfe…

MALICIOUS

PDF

77.6 KB Created: 2021-01-25 20:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d983f593894b3b065875d1bbbd82144c SHA-1: 7fcef6a266252fb85a375bb612644d7a4370bf9c SHA-256: 73e82a4a20d04dfee97a687fcf3dcd5e86e5fc7f049c4d55bc5228c7c02205d5
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=american+harvest+snackmaster+dehydrator+2400+manual PDF link annotation
    • http://omshop.space/96537256390tzzsy.pdfIn PDF document text
    • http://appletopshop.ru/potarvh9bw.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/jUcicKq/drifting_lada_vaz_car_drift_racing.pdfIn PDF document text
    • http://khareedforosh.com/disco_ball_zoom_background_free147fj.pdfIn PDF document text
    • https://cdn.sqhk.co/pexufenek/VhigiEW/best_old_rock_songs_youtube.pdfIn PDF document text
    • http://trokot-tonirovka.online/terro_ant_killer_liquid_ant_baits_instructionsyti2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415530/normal_5fdf2f9808066.pdfIn PDF document text
    • http://marketop.club/history_of_japanese_language_booki6eyp.pdfIn PDF document text
    • http://arevakar-travel.com/paradise_california_bowling_alleyw3pxc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubodasitonobu.epizy.com/tapebuxodalasaponepifoda.pdfIn PDF document text
    • http://menoziduwuju.epizy.com/adobe_photoshop_for_pc_filehippo.pdfIn PDF document text
    • http://mefuxunopurojim.rf.gd/jusasoda.pdfIn PDF document text
    • http://sovizaz.epizy.com/transformation_from_caterpillar_to_butterfly_is_called.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/29524877514.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/chuchu_tv_kidsong_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/fedigoremutivine.pdfIn PDF document text
    • http://dukuzuwikisos.epizy.com/37301866923.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 6440 bytes
SHA-256: 0c87adfee0db9a765b815d0f1a200964622767398edfc94767de76fde9ca8be2
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 5756 bytes
SHA-256: b34ad7c7a93cee25a3bc32a6f8ba00d987ef4e4233300982a7b654c14b894ab4
font_02_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 11228 bytes
SHA-256: d302e0d3160e0bb49ecbd0678319f1a7fd93927d6aca01bcec94eafb41d2d119

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