Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0004849352e1ff7…

MALICIOUS

PDF

69.2 KB Created: 2021-04-05 12:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 78c7b23b683f094af9d5e384d44d14ce SHA-1: d480fa8830213f7d425d2195ca809311ec3a63ca SHA-256: f0004849352e1ff76bbfd711c3942fcbc448940d7158e7d41189b87845beea69
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to drive traffic to external resources, potentially for phishing or malware distribution.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=bon+jovi+it%2527+s+my+life+karaoke PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fd7a9b91c911.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/LQSijjg/onedrive_sign_in_error_0x8004de40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_604699d224882.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/fHlghij/boarding_pass_invitation_template_photoshop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_5fd22b7dbb63e.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/ggjbhjj/miresukirumuzugur.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/Dhjgjhi/kebew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5fe00b5933131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475852/normal_604470f2c3f21.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/ZPwjepc/prison_planet_sci_fi_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/jyibFvq/29809115704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411700/normal_60013197e3d6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417523/normal_5fff390b954b0.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/4fujjdM/play_crash_of_cars_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5ff925c6daf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_6061126718b68.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/afbff7c2-ec73-4e40-b406-c3b6472a644a/rosedum.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_1b6c55d1a2aa4261b4935dd2a596a3ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc16dd1-a782-4b24-8386-61c002f449e6/english_as_a_second_language_teacher_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a14be8-39d9-4876-8ded-f56477185940/werijakutek.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_253ef1dfcf7b4da1a36714caae507d67.pdf?index=trueIn 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_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 5296 bytes
SHA-256: 806f0e3c38ebad953aff31ee6de4b2060e1101a46aa780cc2f72c7f375203fc4
font_01_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 12552 bytes
SHA-256: 4560d2341b22ddeb63edd2f40a99d3f5e19fc5c9d12575aac5515f7d2253a80e

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