Malicious PDF — malware analysis report

Static analysis result for SHA-256 724d1516f5370ff3…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 16:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f405059fa46aff70ebd8358444dedb66 SHA-1: 2072bb2a46193c2b51d29b72cfd4cd45b245623f SHA-256: 724d1516f5370ff3c73c7cbf77d65c8bf14684e6279c32c4443134aebc3c639c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'bodybuilding exercises pdf with pictures', indicating a deceptive pretext for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=bodybuilding+exercises+pdf+with+pictures PDF link annotation
    • https://cdn.sqhk.co/vawapisoxe/ceTjg04/oracle_colorshift_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sozonexof/gfwwjeJ/pivudizudewanevitumix.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/gexaekl/skydive_spaceland_houston_rosharon_tx.pdfIn PDF document text
    • http://chatik85939775.fun/53177702805i9kd0.pdfIn PDF document text
    • https://cdn.sqhk.co/xogatijixe/rhf48hg/bengali_babu_english_mem_film.pdfIn PDF document text
    • https://cdn.sqhk.co/piravasufinu/hjjihgd/color_splash_effects.pdfIn PDF document text
    • http://beach-fruit.fun/taralaxhqfod.pdfIn PDF document text
    • http://winclean-shop.space/letter_x_activity_worksheetsgjgps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_6035d979915c5.pdfIn PDF document text
    • http://presentinsta.site/chandamama_kathalu_telugu_movie_imdbq7v1p.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/8hhMXdu/22963790777.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/Fo1Xhfc/teacher_assistant_job_description_lausd.pdfIn PDF document text
    • http://randname.ru/visual_basic_tic_tac_toe_code_downloade48ho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_60464105ee651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/253afbc0-0b70-40f2-8d95-77d76bc3636c/25152216465.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/xenorusuwipubijibuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fd63d6-db0a-4ac7-8a38-6610ba3fc0fe/93699124511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6fa8cf-02ac-4860-a230-7d15e7915d38/88142395824.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/ginabevozunonupafot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b237cf-ab6b-47d7-9b49-25abed4c0e4a/why_does_my_lasko_heater_keep_turning_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7ed303-8ff1-4694-8ebb-e97542c64e72/brother_ce_4000_foot_pedal.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_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 5656 bytes
SHA-256: 0f00a15af87f235fdfbe4156ef4c0404be5a58147a67bc06ea94b6de2ceb8ff8
font_01_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 10828 bytes
SHA-256: 2f6047ef95d82ea1a2da5fc9dd5db8bce0d53f6960dfcc7c14192cb607a35817

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