Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b26053a79167f11…

MALICIOUS

PDF

67.8 KB Created: 2020-11-13 14:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6f97c2be8a0380889a87b740c0221b0c SHA-1: 1bea252126b68bd097191a474594913279b6a5ca SHA-256: 9b26053a79167f11470b87a2e68f1896c67729cb2c89b284df948e135982b84b
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with one pointing to 'https://trafftec.ru/123?utm_term=my+last+duchess+analysis+pdf', suggesting a link farm or phishing attempt. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a large number of external links, likely for SEO manipulation or to host malicious content.

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://trafftec.ru/123?utm_term=my+last+duchess+analysis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f8b531bc27b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_5fad5df79a2c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f9c0a78f18ff.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/melolinevaxasozigam.pdfIn PDF document text
    • https://judorobizud.weebly.com/uploads/1/3/4/4/134455398/tokig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_5fad6398eeb58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fa7e208e4998.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/takeju/10701495931.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/napelubipe.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/rekep.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/25883238939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b7384f-8c05-49cc-b6bc-2827a5ccecb6/paul_wilbur_dias_de_elias_espanol.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_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 5252 bytes
SHA-256: 7722dfc470ab6340f5d37ac9e03fd048ab0b7a9c69c4ad6aeea0045808e3d3db
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 9864 bytes
SHA-256: 78d77afdd88104ae2915b85d857103fd0526abfd0624afd967318e83deaf293b

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