Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f593c8f79e5e26e…

MALICIOUS

PDF

59.1 KB Created: 2020-11-17 08:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1cd84225ee4eee2c9f6f4c5c15629f06 SHA-1: db8b6914043cfbe4ce7c63b431bd3aec0579dbbc SHA-256: 5f593c8f79e5e26e5402aaaddd86d72176ea87ae7834c3ac4dd396ea1ebe96cc
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 0.9996

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://traffset.ru/strik?utm_term=skating+vince+guaraldi+piano+sheet+music PDF link annotation
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/rizekerevinidul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f872c3ac0194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fa0ae15caaab.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/tawonoxukibokotofe.pdfIn PDF document text
    • https://dikosunasalimob.weebly.com/uploads/1/3/4/3/134363034/dejiwav-wusiril-dadudeve-bilobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_5f90930a562b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fa3349c5a4aa.pdfIn PDF document text
    • https://wezogefizu.weebly.com/uploads/1/3/4/2/134234847/3531676.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/d28995af60252.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/wovigebi/my_time_at_portia_museum_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/y8.com_raft_wars_2.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_off0000aa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA43 5716 bytes
SHA-256: 5ef8b333b8db0de9c8a685798185565c9994b67547ee91402a70a8cc484f6772
font_01_sfnt_off0000bd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 10040 bytes
SHA-256: 157c1295ca2f344ae17276dc9d51ee799e3ad474b5f68e6dc93a0706887f02f5