Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1b09fd344b7ddd…

MALICIOUS

PDF

67.3 KB Created: 2021-01-04 20:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9167b43fdbbaac466e2cf9bdd0df6ffd SHA-1: 8c13fd0e88fa6499ec501722ae946a35f5946386 SHA-256: cf1b09fd344b7dddab66e5853fd55edcb8cd83c7408cb15545a8b8fb9a108026
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URI pointing to 'traffset.ru'. Additionally, a critical heuristic indicates a mass external PDF link farm, with the first URL being 's3.amazonaws.com/bisazabe/nowoduzizukudagex.pdf'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution attempt.

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/aws?utm_term=dispute+multiple+items+credit+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487622/normal_5fbbf5330172c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fda7974e2090.pdfIn PDF document text
    • https://nirilixurem.weebly.com/uploads/1/3/4/4/134474770/sipotuwuzafuxu-sodufafowixab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5feb57e46add4.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/bisazabe/nowoduzizukudagex.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/chihuahua_dog_breed_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/digolijugidizujozuwuga.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/jogaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/badoo_apk_android_4._1.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/terraform_aws_s3_bucket_object_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/formal_email_example_for_job.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_off0000cdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD2 5008 bytes
SHA-256: 81c334416e098820a7efd541d6e75f4b89aa358b1431f3fe872c6c6d81cb296b
font_01_sfnt_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 9924 bytes
SHA-256: 1f0ed70f38c7a1675267e608c587924a433a8969e4276d5125cb30595f4ded9f

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