Malicious PDF — malware analysis report

Static analysis result for SHA-256 854a770c83b6663f…

MALICIOUS

PDF

72.7 KB Created: 2020-11-24 03:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a98280bce7a6e25c5437b76bbc4247b SHA-1: e2564e910634922535fa87a19d7ac64a085b5c6d SHA-256: 854a770c83b6663f930b7d4cb27b9d52d987a4a03e3e48fc1ee1bc49bf8c7397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://traffset.ru/strik?utm_term=judgment+apocalypse+survival+simulation+resin', is flagged as suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized PDF. The ML classifier output of 0.999745 further supports its malicious nature.

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=judgment+apocalypse+survival+simulation+resin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5fb2935400bc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fa50f9f3f511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5f96844045782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_5fb42a11d3a2d.pdfIn PDF document text
    • https://dewubolisevibe.weebly.com/uploads/1/3/4/3/134318954/xalojomabukubaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f9383e012096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_5fb6a8158b2d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_5fb35436d1c5f.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/ff704655-8134-4af4-a629-32519d83a3c4/27609965544.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/2d_platformer_tileset_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c17431-42d8-4bdb-823b-4184bf76bd36/wuwurogufiligulabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cb303e-473c-4589-855e-40fdbf75f1e4/namosixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4441e15a-a229-4c5e-8f48-b4a89ce37fcd/gw2_nevermore_guide_dulfy.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/92412951101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3edfe8-fe25-4ee8-b2eb-05f37762db2a/83248550469.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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 5544 bytes
SHA-256: 7dadb35069a299d63ec36fb6e34876f08f1229ce8fdd1617709f1ed9b8216508
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10872 bytes
SHA-256: 165ae8a3fb783762b96f53fb054f0a3fbc5548555d0fa8399b60d9524f33124b

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