Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c4081d59c30cf9…

MALICIOUS

PDF

63.2 KB Created: 2020-11-30 05:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 512207880133ed85113c338d61d9f2d5 SHA-1: c5281d4af3b5187c88601f4b9f8a5f62300c3bae SHA-256: 77c4081d59c30cf97c3b03384442a5e9fd69fa2ebffa3c2e777b42117ecaef75
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'trafffe.ru', a domain flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to potentially harmful content.

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://trafffe.ru/123?utm_term=beat+your+boss+unblocked+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fab10919f074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5f9728ea7e1d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445880/normal_5fc434d89958e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f8b112365366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f8d4b118fd91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_5fade53f6d15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_5fb32a217e598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f8ca9aab8038.pdfIn PDF document text
    • https://gegovufefole.weebly.com/uploads/1/3/4/5/134520867/gelolijowidale_kuwuxit.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/f8257278-3b06-414d-a493-fa4e5270b84e/84655460074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfdef3b-872d-4e9a-ad49-1ba283444ce5/xewijifanuwinutibuteta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce483cd-e910-4e9d-9ed7-cbd7458650b3/laresatebubuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1f56db-9f8d-49d8-b786-ef849178ddbe/jogonibajowewapanada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de89e634-b4f8-432a-a3bd-6a600425d0e2/worksheets_on_irony_and_hyperbole.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_off0000bac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC1 5612 bytes
SHA-256: 6f13cbacfd6703c7ba154421646115ecf21960dc832a34a34877324ec0f1b94f
font_01_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 10044 bytes
SHA-256: bd61f10492ce8e1b08319bc5ead1ec7d7e163f0303bd1a0eb2c9702985dc880a

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