Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acee0e401479a0e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 19:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e7e57225dcbef42e64f0f6edff16e09 SHA-1: c55916277f6aedfc34b97231a1dee79c5a767710 SHA-256: 2acee0e401479a0ee8446f7265f517cd256a236bdf9c421c18868c9872257ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=gta+vice+city+cheats+ios PDF link annotation
    • https://tigaintan.com/contents/files/39541142527.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/nirexiwugokasavimatugizan.pdfIn PDF document text
    • http://erpos.sk/data/files/vizovaperujuvutujolikopeb.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613decd104d34---lelajemeviwimu.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sotezuxoge.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9a8d8f7c4a7f10af4329609c18dfe368/virubakolino.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/pamuvojoxixiwekedusopi.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/jufigujezadeve.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/wadujipukuxego.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/zijowalizizititesumofade.pdfIn PDF document text
    • https://servicepapik.ro/files/94036530201.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/buzizagidap.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/rapopenajoka.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/nogigofivojobupewag.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/11225291982.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/sepebisoge.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/xebojitesuto.pdfIn PDF document text
    • http://alltechsro.cz/files/totiketemerodufoj.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/pikerexugodakiwevevi.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/povasemotapoj.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/94360552378.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210916_F0FAB8B53ADBBAC6.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/fuduteleb.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://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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 10296 bytes
SHA-256: 14fa4a08c18697dc541e311580bceb74b928f7d4963773eb17d93a45058684cf
font_01_sfnt_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 16096 bytes
SHA-256: 1e5455ec108452b8773afc31290eabba22ca24faa1a9a965b3393cbf8938e9c1
font_02_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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