Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6cf409cd483b87…

MALICIOUS

PDF

70.4 KB Created: 2021-02-26 06:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f5b04d00fd8c7366c8441ffa1cfda5a9 SHA-1: bd7f71b0aa9afd9cd7da04d5f901605bcfdeb98c SHA-256: ed6cf409cd483b87f3e91eb148b9bacc8891699376ea1b9d468071df3f035be8
126 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs further supports this, pointing towards an attempt to redirect the user to malicious content.

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://seumenha.ru/wix?keyword=phi+chi+theta+iu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477629/normal_6036cd7ba0fb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcf7b7a0f52f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5ffd6a2d2fd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_601d67b51f849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fd33effc278a.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/hhijgd9/99139257187.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/jWJRW3o/97280895779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5fe3a5943353b.pdfIn PDF document text
    • http://kefinefure.iblogger.org/bio_rad_cfx_manager_software.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/cw4mKjh/switch_pros_controller.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fc901855ecd9.pdfIn PDF document text
    • http://kidepokapila.22web.org/gerepabaditawarawutaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_600c49d049a11.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/jezobasit/resistance_tube_core_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/bisitosuxesemukasiseju.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/consonant_blend_worksheets_for_first_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/bloons_tower_defence_6.pdfIn PDF document text
    • http://gonoluripep.rf.gd/abhinaya_chakravarthy_video_song.pdfIn PDF document text
    • http://susugafof.epizy.com/53813033012.pdfIn PDF document text
    • http://burijudipo.epizy.com/wanavabe.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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 4580 bytes
SHA-256: 33afe8e52bc311d9ffeea71a2c9382075f21db53a4c561829935de2ceb894105
font_01_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 10484 bytes
SHA-256: b71da057c6149a2a79c60b1456d0b7e5cfa6388be3ce4f842ab920afeda284c8

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