Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb125be31bf2745…

MALICIOUS

PDF

70.0 KB Created: 2021-01-29 00:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fede19316cb5057a94ad66d281a2299c SHA-1: 1cd0a1ef3dada48796320bd4722dffdf4b5b6168 SHA-256: ecb125be31bf2745767342431dc8f23809f86909ffdd87af5e7f51f01f207371
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=blue+buffalo+grain+free+puppy+food+feeding+chart PDF link annotation
    • http://sawawobutexukut.iblogger.org/target_cal_king_bed_sheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456377/normal_5ff75eed06415.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/486501581534joss.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/ija0ij6/60898526412.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/tjgheij/pipe_dream_script_for_3ds_max.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5ff0166f376e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/fbjiicn/52246019605.pdfIn PDF document text
    • http://edapog.online/mixubonanugitezalakukebuwhup4p.pdfIn PDF document text
    • http://trenketo.buzz/pac_man_fever_album_downloadev18m.pdfIn PDF document text
    • http://wgathering.org/sunstone_volume_1y7itz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_601003db81c9d.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/5956kN1/photo_editor_app_for_iphone_collage.pdfIn PDF document text
    • http://forexgeeks.net/lafirajimiputilanomixijffvr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_6008e9b31bac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fe640bc6f836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lunijikujapike.epizy.com/perufawubunufobimo.pdfIn PDF document text
    • http://bopamebedozupux.epizy.com/rose_border_vector_free.pdfIn PDF document text
    • http://zaximibirada.epizy.com/51217420588.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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 5528 bytes
SHA-256: c27ba00357901ca34e5bdb3dee7bab33741ea8604f3d8b3d5be37753fd42e7c8
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 10712 bytes
SHA-256: a612df4c4387f878e9af20ac4be61c1d802c1f3c9361e7fa696d5dd718119272

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