Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e12771715cf0ff…

MALICIOUS

PDF

64.9 KB Created: 2020-12-17 23:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a22ba58a67e6a8f4e64a1434fd70a61a SHA-1: 357e55f83c9c71edd7b594c21b7292c88e3e24d2 SHA-256: 29e12771715cf0ff8d07c77f7fa7040e6f0a42d1606fa0dbaffe0f532b2b112b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate that the primary function is to redirect users to potentially harmful external 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://trafficel.ru/strik?utm_term=uscg+bmc+swe+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fd7cbec37a4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5fca53c4ebf13.pdfIn PDF document text
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/jularajut-lomewazazevapiz-gemaxanad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_5f95f1823a2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fd20096eed04.pdfIn PDF document text
    • https://solezoxi.weebly.com/uploads/1/3/4/6/134654925/gevumafite.pdfIn PDF document text
    • https://fenatelelopowi.weebly.com/uploads/1/3/4/5/134510159/febe2e898b0b.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/846d43c3-e877-4d2a-b3c4-324641ab10b2/rixitanekijugutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e16312c-20a4-424f-a668-2748479671d4/ap_us_history_historical_thinking_skills_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f004fb0b-8e43-4fae-91cc-72a6fa020084/muvipuboxukesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e468bf64-8c8f-4772-9d15-509f4f268e54/dokol.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_off0000c11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11A 5248 bytes
SHA-256: 3bf420e35c26a2b36d1857ba5faa52c90689f4cd9fd9bf38e787bf1359e6fc25
font_01_sfnt_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 10716 bytes
SHA-256: fcc2f7635add83e0112932f3113dfc7e2ca2d5728c4eddd6d2fda3a04289f973

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