Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e4bfac61fb1bb0…

MALICIOUS

PDF

79.5 KB Created: 2020-11-17 23:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00cc2f5acf41c9e980d2c076683a5972 SHA-1: 439a89ac28939d0c0f5468c86cb13b0077c3314f SHA-256: 24e4bfac61fb1bb00f43fb9b8a039b1f44a38fcb210b923c74a30f28fe04f5dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially malicious or deceptive content.

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-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://trafftec.ru/123?utm_term=castlevania+3+characters
    • https://cdn-cms.f-static.net/uploads/4449399/normal_5fb27e6deeda2.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.pdf
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/6297767.pdf
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/dobadetodawavori.pdf
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f8f22566d026.pdf
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5fa2e7ef825c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f65400ed-2f24-400e-91df-c20d8fd661a8/95735412906.pdf
    • https://uploads.strikinglycdn.com/files/bbce6a97-2df8-48c1-9136-24cc03793bc5/blockchain_applications_hands_on_approach.pdf
    • https://uploads.strikinglycdn.com/files/97a83b42-047b-4f11-b162-216c9d96faad/unblocked_games_websites_66.pdf
    • https://uploads.strikinglycdn.com/files/9618f23c-be5d-4edf-a1dc-e999492f0795/23569319471.pdf
    • https://uploads.strikinglycdn.com/files/9c377bfc-d0b3-45e3-913e-a014aaead5da/5685128236.pdf
    • https://uploads.strikinglycdn.com/files/7691531b-34db-45f7-980a-286fb92a4f3d/social_problems_11th_edition.pdf
    • https://uploads.strikinglycdn.com/files/439fbdb2-d9eb-46e4-be62-7914cdf5a794/93095168152.pdf
    • https://uploads.strikinglycdn.com/files/0ae9ef89-5d63-4f89-9366-bb90cbda4995/dexegetovivonow.pdf
    • https://uploads.strikinglycdn.com/files/a19e56f2-39ee-460c-b972-bf0b1a9e30be/42138904382.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb75.bin
2b4612494c693cff33ec950aca08a9647e1e7bdc0dac88b0dfb0a4172fd23162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 3940 bytes
font_01_sfnt_off0000f94e.bin
dcbd8e978bf151ec72be254080ae851ee0a3ed2d00d7a304ff87f27c3061116e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 5016 bytes
font_02_sfnt_off00010a57.bin
c5ea111525dc265164288c4ae38fe98aaca89525d73ab3b0f164b6af7278e8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 11544 bytes

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