Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6b0854e84d0cc8…

MALICIOUS

PDF

65.4 KB Created: 2020-12-24 07:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 346a8a8669ba773a7e0cedcf31f78986 SHA-1: ed7236a00d611aa2dbaf489799c5a340c70f71dd SHA-256: ff6b0854e84d0cc86bd1358acac5d79b6f12744935d3fb189a5e32efab486a6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, with one pointing to a suspicious domain ('traffset.ru'), suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a potential exploitation vector, likely involving client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=virtual+piano+notes+for+tum+hi+ho PDF link annotation
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/4804019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fb55c65f1b74.pdfIn PDF document text
    • https://wotakipinamiwug.weebly.com/uploads/1/3/4/6/134687545/nifizapurozifugugop.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/mamibis/firefox_52._9._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad17388-4bd5-47b8-b730-542d32764e67/82158411762.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/3741581941.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/badminton_player_information_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/58806619722.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/48170018506.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/envelope_printing_template_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/kavuvimasato.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_off0000c2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E2 5108 bytes
SHA-256: d1eda5582def2d31ff520f015fce10dfda2740169585edf68916d35aa6d9693a
font_01_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 11008 bytes
SHA-256: eefb3ab9b63cb31b223380b57e79d756216c534b87f8709c6feb285a8f665de1

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