Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91f6e3b65d806be…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 02:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a39ff51061043ad110ed9d3dd98c204a SHA-1: 3d6249d403ad6d25068c7c8ac5bd347a0f5b2932 SHA-256: e91f6e3b65d806be6f49e55ec1b985cd58a2fab109902c457f6f1fa8832f5a96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or link-farm domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many disposable domains. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://commune-bourre.com/userfiles/file/losape.pdf In PDF document text
    • http://atoutslegion.com/userfiles/file/25194999598.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/botava.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/55429196485.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/pememida.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lavunogatepemuteseja.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/binurisogo.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920082130_15isxa.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/vinifobija.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/motunogajebon.pdfIn PDF document text
    • http://biroestarsa.hu/uploads/file/juxoporedi.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/vemidan.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/gukefazezepi.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/95793928845.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/32873228920.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sutomabomujetolekar.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/sexudawofosadopaxuwibum.pdfIn PDF document text
    • https://svltv.in/userfiles/files/84032240260.pdfIn PDF document text
    • http://sptcrane.cn/d/files/31157295189.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/biwelidefemoraza.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/medivatezugeniwigaweroz.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9722eab2288a15c1c8071f1e844f06a2/rugifuxeneluwopixaj.pdfIn PDF document text
    • http://podushka.by/files/files/98711110663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rick+and+morty+season+4+free+onlinePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2B 10964 bytes
SHA-256: b5dd7c50764358d929bb1984b2f0491033935603404d3c9be8b61006412ac342
font_01_sfnt_off0000c7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 15724 bytes
SHA-256: 52176433de295185d8288297d91341b65430c2b39590a6c56126a5bdf259a2c8

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