Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d41fcad9502e45a…

MALICIOUS

PDF

69.9 KB Created: 2020-11-11 09:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 34653e90703d9ecf6250795b9179963a SHA-1: ded906819bbad980c6271f837c23bf463d2dcf8a SHA-256: 8d41fcad9502e45acb1304fb8ed11ab9e98cb6f285bdc04a442ab07a7c02dcd0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • 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.
  • 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?keyword=situational+archetypes+the+journey PDF link annotation
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/3425577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5fa3965677806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f94c6fe9fe1e.pdfIn PDF document text
    • https://vewawuwidavejo.weebly.com/uploads/1/3/4/4/134403009/bezagebevuja-boledo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8cbe21e7e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f9439326c15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5f9f6358d4e95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5fa9e20270805.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/5352bbf4-46c4-4aa6-9274-d90b3b71f648/bomonilowutatikodilejuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8114f9cd-1ed4-4778-af4f-baf75a1b4c97/jawisoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6731df-5a99-4230-b3e2-1358caf2596f/37041163937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d3621a-2f06-4194-bcf4-af3bc8c11de9/89673895236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a564da26-06cd-48bc-a24b-36f82fc613be/yu_gi_oh_gx_season_4_episode_1_english_dub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ccff84-e343-4398-8ee2-a16da3c8124a/89385388858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d34a358-8f2d-481e-9d4b-4dcaa1066a8d/rusudawupup.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_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 5300 bytes
SHA-256: f0795b5fcd69eee5425e4a20126850fbc04e1f375c3f0a62203d21011baed7e8
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10240 bytes
SHA-256: 92b98e48e506de4489ce3ccbaa005216608c6e70192182be574f11ab555b51d2

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