Malicious PDF — malware analysis report

Static analysis result for SHA-256 66098bcd8e746ae5…

MALICIOUS

PDF

71.4 KB Created: 2020-12-16 00:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6f0a2aeb02dcc1da75341b4f62c8ffde SHA-1: 6ad0e21e1f2f1ba7ba2d8b09e20a438ddc241e6f SHA-256: 66098bcd8e746ae58680ae0f90912aaa4fd680c04d912097092f84a1cc3fdeae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to external sites, indicative of a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of external URIs and the overall structure point towards a phishing attack designed to redirect users to malicious content, likely to download further malware or steal credentials.

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/strik?utm_term=fb+auto+follower+apk+2019 PDF link annotation
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/5f33bd8e.pdfIn PDF document text
    • https://zejabunu.weebly.com/uploads/1/3/4/7/134719965/79c3b785.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/561132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f9656fb50acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fd933bb35d26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5fc5a61b1e2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fbbf5a826cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fafd3cc6736d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5fcd7f29e9313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_5fb756b797636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5bcc2dd96f5918e62686/1606376397727/japusuvosafusenodadazat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc111b5ff13940aa240a14e/t/5fcaf4e21ef6d1662fe5a1bf/1607136484712/37962180519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a54f20-ac83-4bd2-93c4-b5bc54fcced2/gijafalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25ff457-9b58-4bf7-83bc-bb31ae623eb3/recording_studios_in_high_school_nj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 5452 bytes
SHA-256: d460c04d2c50a65d987fca831e1767396750ef3ad2b64cb94a9fd89d5fd7c974
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 2372 bytes
SHA-256: e7f99a801a83e9e338436850d034a5ec2cd41ae778e28f7c79ed4b80d179693f
font_02_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 11048 bytes
SHA-256: 9199686ca47dcb177a2ef30f021053e74dc4ba6d1aeb1052f98502c6f04e391c

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