Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4615bcb4ba5657…

MALICIOUS

PDF

70.0 KB Created: 2020-12-19 21:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f55394393f630bc9ce9476e3025878cb SHA-1: 82d5d06e51f9079e5d27250dd6c04328113872d3 SHA-256: 9b4615bcb4ba5657db85b84ef859f5051345d12d62fb8efff0fa72b8e6196056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, https://traffset.ru/strik?utm_term=no+filter+band, is directly embedded and likely serves as a lure. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of this document. The ML classifier also strongly indicated maliciousness.

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=no+filter+band PDF link annotation
    • https://fawibilewitowo.weebly.com/uploads/1/3/4/5/134585577/5ffea18459f0.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/sepatogoxinigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_5fda1ac626974.pdfIn PDF document text
    • https://zizavoxepob.weebly.com/uploads/1/3/4/4/134479394/6268350.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/9625027.pdfIn PDF document text
    • https://xosuloduviz.weebly.com/uploads/1/3/4/8/134890731/6408584.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/dawex.pdfIn PDF document text
    • https://gizumefelaz.weebly.com/uploads/1/3/4/3/134318195/ferasifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_5fd9db235c1b8.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/bd0cb1a54.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/libowebujakux/57114356457.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/tazilosemesugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/77421892641.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/brian_weiss_libros_los_milagros_existen.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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 4832 bytes
SHA-256: 7d4c1744e321f0dd6ba1a2fd350e5278cfd634d1ee9c6c098d1048d16c85c0a7
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 10240 bytes
SHA-256: 78403a41d32f9e906a5f3ec205594340e98427155c2871857e0b5785a44a9185

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