Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda287a3b78ba63…

MALICIOUS

PDF

62.6 KB Created: 2020-11-21 02:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f215b064504c2c14e3ae350602730234 SHA-1: 2865011df8874cd39d4ea01950079da31e9ddb07 SHA-256: dbda287a3b78ba63e6fa20a3d754c08614609272c9056b9e735c40326f39a35e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://trafffe.ru/123?utm_term=daisy+red+ryder+1938b+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fb8259716687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fb6b70a4f18a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_5fb5e5f4076d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fb4b44683c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fa4232dc6ae0.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/pugunuzanugetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f9bedbac2984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5f9583811ffab.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/wanasuvedigo/what_is_the_difference_between_a_population_a_community_and_an_ecosystem.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/53658331064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3bf14a-68f0-49d0-be57-ae0cff373980/vijajuganuzapaxula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c478de21-d415-4095-99f7-6748e188c5bc/masazavusokinap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553cab0c-5f60-400d-9de7-9ad94dcbd05d/jomufugu.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_off0000afef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 5780 bytes
SHA-256: 2d679dfd0f918a6063f8afe883f1ab29f74c824301d2b5992645af01e42de52b
font_01_sfnt_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 12940 bytes
SHA-256: fd6ad2854a6fb46edb115443eac41a621d131e454de94b4a3075952e3d1035ec

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