Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c95855461794a2…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 15:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0073d4658f5d2c064cb5861c6d4906bf SHA-1: 240c8b4c08fb8fb2aa1b0b0055d08b0f844245c9 SHA-256: 07c95855461794a2078f47fca38aeb4d34c82618438f29be51d6886b848eb8d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=numerical+methods+using+c+programming+pdf PDF link annotation
    • http://tele-fonika.pl/upload/file/86421077300.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479f73509d1---67716477453.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/weruvepugumozu.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/pukot.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/walarolomemetozepu.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/30029478764.pdfIn PDF document text
    • http://panteres.com/files/files/mewiramobufibowanizusag.pdfIn PDF document text
    • http://eko-uklid.com/files/file/nijigu.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/6875000610.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/vurusimezisaxiwapesis.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/90156336075.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/26960765259.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/29306169726.pdfIn PDF document text
    • https://network-italia.it/file/40397825008.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/57c7ff416efee42d683645dfa7655c4d/45063058694.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/18903706905.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fuwajenuzevadiz.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/dapubemipebepurireko.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/lamabivemiziwosakipamoniz.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/nowipabofoseme.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/jugod.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/39380348655.pdfIn PDF document text
    • http://linza-market.ru/upload/files/tazodin.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/18873220642.pdfIn PDF document text
    • http://xprchemical.com/upload/files/fidusar.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_off0000afe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC800 11144 bytes
SHA-256: c0d9b8b712a690ad09013c4f7f96cf6ed1c450b05e9e6720ad7d574428ec468c
font_02_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 15332 bytes
SHA-256: de0345c77485852ea7bb2c0e2557d958ce8f01e49038d7c79eb8228ca7d44e59

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