Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9a5b57568b054e…

MALICIOUS

PDF

67.2 KB Created: 2020-11-14 06:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 708f8da16d59779215836365a6582223 SHA-1: d614374fcf048955162b84f949382ce025988ca2 SHA-256: de9a5b57568b054eb9a330bb5d266fbeec174a9ffc8c769ff55b2d122c23d0ed
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/strik?utm_term=the+virtuoso+pianist+pdf PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5fa71bc64bfe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5fabf52590f75.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/1258475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_5fad70e514127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f8ab86ab43df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5f9b22581a814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_5fa8632746f61.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/c0e6db33-590a-4aef-bf3c-a3e7444ba076/59332870996.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/tuzunixuwi.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_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 5108 bytes
SHA-256: 6b470390140789925b806b5a175e58fe1884a7dd168f3f7d077dfe9058565314
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 11012 bytes
SHA-256: 47eb69272d9a2de02e9e5e3c6918e54b7d824789cee55b39a7aca20d34672d22