Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cff8fe7ad123a9…

MALICIOUS

PDF

77.2 KB Created: 2021-03-21 05:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1aac9e644ccf5f26ae5af4ce409a0fb1 SHA-1: ab2b6e80c3c6ff5726663e7007ab927779a608fb SHA-256: 20cff8fe7ad123a9944a935729f5f1e31e36f109682a044dc135dd177de6147a
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 and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('seumenha.ru') that is likely part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, suggests a lure related to repair costs, aligning with common phishing tactics.

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/strik?utm_term=how+much+does+a+refrigerator+repairman+cost PDF link annotation
    • http://sokobumoxagug.scienceontheweb.net/tumikuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_600d1aa857294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_6020996abaeb5.pdfIn PDF document text
    • https://cdn.sqhk.co/nadizolobe/ehihcjb/8187824686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_602a244886402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_60250ce141dcc.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/qWoX8ic/cod_warzone_2v2_gunfight_tournament.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/hiaRmjc/camtasia_studio_software_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_60270e7ba8a68.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/how_to_make_a_paper_finger_claw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girodoge.epizy.com/77054982287.pdfIn PDF document text
    • http://jowosos.myartsonline.com/capacitor_bank_connection_diagram.pdfIn PDF document text
    • http://puwixatokido.epizy.com/commando_2_movie_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/harbingers_mobile_game_guide.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/bunubotifosibe.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/mexomodixunetovatufodafor.pdfIn PDF document text
    • http://lojifasipok.rf.gd/50538023963.pdfIn PDF document text
    • http://bokawevetejap.atwebpages.com/30526683370.pdfIn PDF document text
    • http://zerodawoti.rf.gd/executive_functioning_worksheets_for_elementary_students.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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5588 bytes
SHA-256: cc28624360f4c119d55ab25f09e2378b7946f08479d8d8d88979eb5abee4e3b9
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10540 bytes
SHA-256: 82d3cb7e6819efbbfae183c6e180368e97b0104c0ed325d03e78c6ea3020f235

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