Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cae0bcba7c4c8f…

MALICIOUS

PDF

103.3 KB Created: 2020-11-29 04:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 81a21194f53f544f5fb6f88c2fa48385 SHA-1: 27fcd81f9d02c2e482712b74c78983751422e2ef SHA-256: 41cae0bcba7c4c8f2fcee86224cdc67c9503bdfc3243c21c680edcb924a8c861
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=angles+puzzle+worksheet+tes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f8a4d879b4b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_5fb4a25f61149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5fbc18ff2fdec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f8cfc81677e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5f9926013a792.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/9690403.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.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/d9934248-e72c-4649-a349-92a3633dd183/bitunovejowoxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63031a9a-021d-4cb4-a014-28b92b067d5f/ghost_story_dresden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb790cf-1e63-4460-a651-d18803938aeb/jurassic_world_evolution_population_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c892c80-e513-4af3-80c3-a76f1b850ee9/18764188548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61298b69-99de-488a-910a-86a39c8784fd/88684784251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/550588e9-ae54-458d-8a39-ebb523d45ceb/totivuvaj.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_off0001598f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598F 5064 bytes
SHA-256: c738d7bfda451cf638a297520441bd371c6ba9cda98e329f44e44e37b187314e
font_01_sfnt_off00016ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE6 11172 bytes
SHA-256: dc2a46f25a73eeb819ebee32beaf0e143f1b4016aa79821b44ea7408018a3d98

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