Malicious PDF — malware analysis report

Static analysis result for SHA-256 974fd38f35800dd9…

MALICIOUS

PDF

71.4 KB Created: 2021-03-29 12:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 04340e1cc65a056977d752e43b21491e SHA-1: 565a2bb7bbcb058c069549d76699e7c027101041 SHA-256: 974fd38f35800dd9f0f92ce3e804792336a38a6409ba9adf82bb853f26905eb2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is part of a network of disposable links designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=the+strange+case+of+dr+jekyll+and+mr+hyde+graphic+novel+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5fcd356beb4a5.pdfIn PDF document text
    • http://replyua.site/elips_denklemi_bulmaaql9k.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/gjrVsjg/stadia_free_tier_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wokiwife/LgcWggE/93178218481.pdfIn PDF document text
    • http://webdefilmizle.com/creating_letterhead_template_in_word35fgw.pdfIn PDF document text
    • http://itravelimpressions.com/vocalise_piano_solo_sheet_music233bq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_5fd729c571ff2.pdfIn PDF document text
    • http://pitushok.fun/nudik1yl6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5fda483ca907e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_6055996aef3bd.pdfIn PDF document text
    • http://titoto.xyz/excel_average_all_sheetspbh41.pdfIn PDF document text
    • http://contarinihome.com/difference_between_qualitative_and_quantitative_research_with_examplesbfzjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_60515a5156669.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/1MN2jfD/81141359491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5fd924c0ed1f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_5fd1801e26df4.pdfIn PDF document text
    • http://prizinsta.info/graco_lauren_crib_replacement_hardware3f40k.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/pusori/proof_read_software_quality_accelerator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/basf_se_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/acpi_msft0101_driver_dell.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/how_to_pair_hype_wireless_earbuds.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/vans_old_skool_black_and_white_checkerboard_slip_ons.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 5820 bytes
SHA-256: c0f30299790de3e89b1fd296262861ebe864750a7fe8e2c18d25c032da4ad3d6
font_01_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10944 bytes
SHA-256: 291fddbbb72f6ed24ea48c0b83555f1eb77800685f432650e7103fc720016564