Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d315e603f61fa9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 06:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 76f8ab0d66d2944d0467c61a8cd034d9 SHA-1: e436ef6d453ce01c59f6886da5085db099bf843a SHA-256: 54d315e603f61fa9bf88f5a5790767b717fe54378b40425496f3f0f41638a90d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to unknown domains and are likely used to redirect users to malicious sites. The PDF structure and the presence of external URI heuristics suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://hotlinepro.in/admin/userfiles/file/ludagebuvolame.pdf In PDF document text
    • http://poliinc.com/upload/files/kutevikokaridotare.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/9901517504.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kaxebilixosun.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/9930103967.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/dozazevol.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/ledijevalija.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/lisikelatipulikopo.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/wumuvexunumasusatovinujo.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/tonen.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/82148116259.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/17484724146.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/xetovefogawejaxalopot.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/55439773692.pdfIn PDF document text
    • http://kvrhousing.com/uploads/vixuxusetefinijirixeketo.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/36289859950.pdfIn PDF document text
    • http://bdsductri.com/upload/files/pokasekefuniwidavebu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dowuwone.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/17157972451.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/37686939076.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/renujewaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+change+your+internal+storage+to+sd+cardPDF 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_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 10940 bytes
SHA-256: d03917244f358b9c4740326faf1d3eb01dc428d083f2526308e59032b89d104c
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 16920 bytes
SHA-256: f22c1fdf05cf56c85fbd91e611e02c1e291f1856d90f6e84f743734dc9723fc7
font_02_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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