Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c06ba9cfb089b7d…

MALICIOUS

PDF

78.9 KB Created: 2020-11-12 21:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4792139635b12e46c79f1270009e52c9 SHA-1: 44f6b8e28ba4be5c0f9047e3fa67122b608eea58 SHA-256: 6c06ba9cfb089b7deaec3a9336d09dbfd1b46f344a2103b5876cebfdfa934b33
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one critical link to 'traffine.ru' is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a link farm heuristic suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly unrelated documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?utm_term=sony+bdv-e3100+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5f99427e60697.pdfIn PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/2604354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_5fa976a454f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5faa484b2bed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f91eeab6018d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f8d13bff044d.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/07aebdd68743e.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/nopomewegobij/2007_nissan_armada_owner_s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/dr_jart_sheet_mask_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/41528326756.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/vuliliram.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/oxygen_not_included_starting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/fedawoxuwewunugowabilev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c8729b-a056-4a20-b99b-d9788ebeeb10/mallory_grossman_facts.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010c23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C23 20712 bytes
SHA-256: d1466513be51810475990f9165bd50951cf0af51dcd5be46633c984288e7da43
font_00_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 5524 bytes
SHA-256: 8529d3fccef2522794a78879d329a49c73fd1617758315d8b2c824c4ef64ef94
font_01_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 12012 bytes
SHA-256: 4e6467369913b31bb06d4681966d03c3c72e937b47534938a72bf60b514f09e4

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