Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddcdda95f60b251…

MALICIOUS

PDF

100.6 KB Created: 2020-11-14 08:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 682de34658e668e5e1005a889f753390 SHA-1: 85ad787ef72d9536fff50cd1a3365219e86ffe14 SHA-256: 5ddcdda95f60b25185f2dcee860347232cda3f4e591bf0935a6fd9a1fa8107c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm or redirection strategy. The primary external URL, https://traffnew.ru/strik?utm_term=jeffty+is+five+pdf, is likely used to direct users to malicious content. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to lead the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=jeffty+is+five+pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f875cc4398d4.pdf
    • https://cdn-cms.f-static.net/uploads/4403417/normal_5fa881cee3872.pdf
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f9f138b5d6e1.pdf
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f888d583f60b.pdf
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/nojidaduparubupoji.pdf
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5fa428b5d0834.pdf
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5faf7b9b83813.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8864a9090d9.pdf
    • https://cdn-cms.f-static.net/uploads/4459322/normal_5fa22c016c36f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pivetuzadujo/podejerurotuwalo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fea.bin
09a08bb7bc82c803794bfe1b1263a590cb7e2867120754cdc93ce2d139f5b882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 4848 bytes
font_01_sfnt_off0001609a.bin
1b2152ac70348595ecb89beec66770bf3e1188a575f4181bbeb01a8600bca8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1609A 11032 bytes

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