Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06ba3c0224b0463…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 06:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4eae763832d0524b05fd096d86cc28d1 SHA-1: 61c6e06c61b69737caf6ef9b4cd23f997fdabd2c SHA-256: d06ba3c0224b04638aa7ddba85c036263a1cb85445425d80d21e24091cacee26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to numerous other PDF files hosted on various domains, suggesting a coordinated effort to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the link farm and the PDF format strongly suggests potential for exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • 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://xpeedon.net/userfiles/file/20210920070917.pdf In PDF document text
    • http://vizugy.hu/uploads/files/files/24088291316.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/65147447142.pdfIn PDF document text
    • https://cncunse.com/d/files/54368391589.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_D715ED5C13E7A24A.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/nexaxusixujirefebive.pdfIn PDF document text
    • http://aromata.ru/upload/files/jekupufojaxasil.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/gulepamobijobeto.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/71017122163.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/petevozowususitatox.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/silatavije.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a04bdca0c---77593327071.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/79849388608.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///15728861442.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nolego.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614cac70c9f43---28352613233.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/98469193488.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/nowepaduweguxumubum.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepinobewijowakef.pdfIn PDF document text
    • https://drlanda.hu/user/file/dolavusekasawona.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/boluwijarobenefe.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/kajapizi.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/89014356118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sd+card+running+out+of+spacePDF 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_off0000b253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 10924 bytes
SHA-256: 0b3085a9501241ac191935d2114c81dbea680c544874eafa8133d3d21f4458e5
font_01_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 17332 bytes
SHA-256: debb1036583ab33490a67cfce896905d317112ad2d2cadaaf2e9220e7ba7f3b6

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