Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd366bfefd1e3203…

MALICIOUS

PDF

70.9 KB Created: 2020-12-17 23:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 34032c347cca1e50299acd6e91d1083f SHA-1: 712f0783a96e27aed145f87d963277acb06ad697 SHA-256: cd366bfefd1e3203c41f9ff96fceedd5185a98b9eb9944b759379cdacc355a9c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, including one to 'trafftec.ru' and another to a Weebly-hosted PDF, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'Fit father project supplements' and application metadata, which could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fit+father+project+supplements PDF link annotation
    • https://fofosororu.weebly.com/uploads/1/3/4/6/134642422/33f9b3ba43d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5fb00dd56a872.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/1675088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5f8c91268340e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5fb29f1916d54.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/nedilepurevevip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8fffa6e35c0.pdfIn PDF document text
    • https://bunewifuji.weebly.com/uploads/1/3/4/7/134709558/xudatepadopize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_5fd741c1bbb17.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/04463735-7e92-4df9-a7f5-e9e59fd90463/83384028945.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf51254e98326c020743e2/1606373669968/lanamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5539b6b3-55e7-4db2-a2b8-f88c879fcff4/vafofelokufibanelikemis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77192176-4b6c-4415-9f48-d490acfc101b/83281023676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8136d05a-1117-4160-847f-76b1e57e0dc1/9535806451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f94b747-266b-4187-98bc-04a0cc996f36/87559954774.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_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 5288 bytes
SHA-256: 7ef52164970da5dfb49453677de500760a626ff3dcd99c877436f600ac831163
font_01_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 11116 bytes
SHA-256: 8d312e11acf7ffc662f6688237a712fb9ca682da0040dc4cd1c48e49e93fdb39

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