Malicious PDF — malware analysis report

Static analysis result for SHA-256 56de09c040f48f09…

MALICIOUS

PDF

81.9 KB Created: 2021-05-29 02:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac01b93b32b1f4b8178ac0c785294551 SHA-1: e76f15fd4c3586ff3461f1deca2b0164de398494 SHA-256: 56de09c040f48f0900809c9a6c707b080fd8fd54e9a91145f6791f6fc8125fa1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://kuzutuzo.ru/strik, which likely serves as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=what+are+the+methods+of+teaching+science
    • https://cdn-cms.f-static.net/uploads/4482407/normal_603608e6f1af6.pdf
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60458699eb15c.pdf
    • https://cdn-cms.f-static.net/uploads/4376879/normal_6025997bb9bc6.pdf
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5feba73d0dbe5.pdf
    • https://nutofagefisamav.weebly.com/uploads/1/3/5/9/135992035/8591021.pdf
    • https://cdn-cms.f-static.net/uploads/4499958/normal_6056c2b8bd146.pdf
    • https://warujupegam.weebly.com/uploads/1/3/4/6/134687544/wojazexokanu-tozonasupego-nifivileso-vivipa.pdf
    • https://cdn-cms.f-static.net/uploads/4365624/normal_606df0b0edbb6.pdf
    • https://cdn-cms.f-static.net/uploads/4450727/normal_60474823ed063.pdf
    • https://tonulaluxi.weebly.com/uploads/1/3/4/0/134099082/kofetuvuzivegu.pdf
    • https://cdn-cms.f-static.net/uploads/4483089/normal_604ae50536828.pdf
    • https://cdn-cms.f-static.net/uploads/4445106/normal_600f10a8c0943.pdf
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/porogumubavosi-vosikogomafut.pdf
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/jiralujabe.pdf
    • https://cdn-cms.f-static.net/uploads/4389104/normal_602c77e759d4d.pdf
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6026695d5fa2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/658ae47b-a32d-4405-9e6d-79821ea9271a/miniature_dachshund_puppies_for_sale_near_me_craigslist.pdf
    • https://uploads.strikinglycdn.com/files/82a91593-c0c1-4f48-9c27-ec1a1bc01ca0/tenipu.pdf
    • https://uploads.strikinglycdn.com/files/26deb034-461d-4c7b-8903-6dda21dbb7d3/33904884578.pdf
    • https://uploads.strikinglycdn.com/files/9ec94cde-1a37-46c6-9714-dddbc6d2760b/38275011466.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_off0000ff8c.bin
71f68b12aa6198bad997b6953d0f15d25f718a42bfb77fd1cc76f7ff4bd3b6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 5416 bytes
font_01_sfnt_off000111dc.bin
065e0872a9d40b26e4fe3f98bb260d338dcf9e55bdf3c51e1363da1f79be6703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 11272 bytes

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