Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6864a0dac19069…

MALICIOUS

PDF

63.8 KB Created: 2020-11-20 12:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b79769b1d26257af85ce399b188bb2d0 SHA-1: df3e66267672e770b6060e7694773f4caa486fc3 SHA-256: 2b6864a0dac190691d12ab744c7b5dec300aca5846f0d1b24ef4e8c2b2632ef6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://traffset.ru/123?utm_term=1+gram+of+cream+cheese PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476941/normal_5fb5dc13170cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5f9e0c7fa3af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fb566b4abecb.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/tuketubajub-joxokamurotafen-xukupexezizenek-sefidopijel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_5f9e7998ea0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f9b7eb0e7574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f892532e864d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f972800b1f39.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/labitajaxatufib/what_time_is_the_husker_game_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8ef8b2-6aca-4d8f-9e03-786a3ccd9067/29184416261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2400e332-b71f-4707-8b98-dbfe54e98e7d/20368417591.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/50257287746.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_off0000bd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD30 5220 bytes
SHA-256: 83212f89277bddf719d356adb391946ce361e9f5137ba7ce615d8e78d441224d
font_01_sfnt_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 10552 bytes
SHA-256: 39a289d7177bb02540142bd301be0224b862ecdc7b44a4a3eddb6616785b32d9