Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9eb949580be95d…

MALICIOUS

PDF

66.3 KB Created: 2020-11-11 21:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 72e9a321703d815c97faff5d5c1f64f5 SHA-1: 3badbd2716131da9231d123efb20f04fc5a5bc81 SHA-256: 0b9eb949580be95d290ee1076e89b299d6236d74ebb67af61c0e4fd9ff26fec4
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector and another to a URL associated with a link farm. The presence of these links, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to drive traffic to malicious sites, likely for credential harvesting or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=balance+sheet+t+format+example In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f961fdd45fa0.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/wunixemor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5f8c16c1e4b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f8717ef30bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5fa91a54d5567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f8717914b9c5.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/sixenogafopoj/photoshop_cc_2020_crack_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8afe3e-5db3-4db4-b707-e54b6e2d2da5/rafenefudumakawozitut.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/95313064831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d6851d-9d30-4080-9235-640a2a8b9c11/pepon.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/52383035930.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/vepunuduz.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/nfl_rush_scrambled_legs_2_unblocked.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_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 5372 bytes
SHA-256: c8df02d41a4716170694f3ca61eb1938d4a6218ed4e403dc0e0a2b9ed178c992
font_01_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 9588 bytes
SHA-256: 845de1fc53ddca5559a31f2fe2667c7bf167b78ba49f0ca3f8485111752fb473

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