Malicious PDF — malware analysis report

Static analysis result for SHA-256 8606a637abd4fe62…

MALICIOUS

PDF

79.5 KB Created: 2021-04-09 11:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f642960ef10629c9b496a37b247f6d SHA-1: 458831d3a123379fdbd01369fdcc345e6162d05d SHA-256: 8606a637abd4fe623511e36be9a4ce433c5bfa669cd15da12cd67b2c39e2a990
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or phishing campaign. The embedded URLs and the PDF structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=cissp+8th+edition+book+download
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/5213755.pdf
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/2317263.pdf
    • http://ceiling48.ru/93786080788yslyf.pdf
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/gekazexodubuvisezis.pdf
    • http://xifasiv.getenjoyment.net/colostomy_complications.pdf
    • https://punofusa.weebly.com/uploads/1/3/2/6/132695323/jedasirag.pdf
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/8548794.pdf
    • http://itgermany.net/tidakosewowakizuzajamvwap.pdf
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/jamomupoverigoba.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_6024159066f2d.pdf
    • https://rimekadosa.weebly.com/uploads/1/3/4/4/134467829/voxidavuzupi.pdf
    • http://podipotekoi.ru/kolonudutekozapipueq4fy.pdf
    • https://cdn-cms.f-static.net/uploads/4472783/normal_601c8a7e02dd8.pdf
    • http://top-salez.site/how_to_tell_if_di2_is_chargingj237s.pdf
    • https://cdn.sqhk.co/danajuva/fhcYjhq/dukejudapatusekusakibimum.pdf
    • https://cdn.sqhk.co/vomemubevu/hthh1Mo/36725408484.pdf
    • http://reliables.ru/tarutof712y.pdf
    • https://cdn.sqhk.co/denugesugumu/XqKihhg/xidozipewikomuregomezi.pdf
    • http://fidesuwuranotif.getenjoyment.net/65321273649.pdf
    • https://dugezuwodovapa.weebly.com/uploads/1/3/0/8/130874298/zopuxikegax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f77e.bin
b613e2efa3a197512dffedf7aac83518b538005d01c47219ed1ff257ca09a6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 5344 bytes
font_01_sfnt_off000109b3.bin
4dd5010d22dac63f1fe2bfa104e2559db3724589c482297004b60f457b4b2bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10756 bytes

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