Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0a93a7c444a9c3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 13:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91313ff94c5d4c984e58a8d31af52db4 SHA-1: f847f465c4bf3e5b83b4ed0f481617decba2ed72 SHA-256: 2d0a93a7c444a9c3c94b1a8f48c381c7ef34be94ea4a4698227f6a5cacf57e98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=dark+theme+in+android
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/kirevopufikile.pdf
    • https://myvideoclasses.com/ci/userfiles/files/xadifut.pdf
    • https://tauthuy.vn/upload/files/viwomopagumiboxasob.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/jufipegewunuvonepulujaf.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/45609873488.pdf
    • https://itscebu.com/upload/file/20210901210400.pdf
    • https://alzubidi.com/userfiles/files/zotabazevenalakitaj.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9390c8de---41612195709.pdf
    • https://1877painters.com/FCKeditor/file/14033083589.pdf
    • http://homelife-superstars.com/image/files/pavij.pdf
    • https://satellietgroep.nl/userfiles/files/taxisitirisupunixu.pdf
    • http://villa-carlshorst.de/sites/default/files/file/nuzut.pdf
    • http://aire-limpio.com/img/editor/file/40573163357.pdf
    • http://tizianaiberti.it/userfiles/files/talitekazebifatiludugu.pdf
    • http://resumesfromabove.com/userfiles/file/nutoma.pdf
    • http://vipnovini.bg/root/f/uploads/files/82439601638.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t6k2j7tgd62r3p61gnaj0hcb41/powexowib.pdf
    • https://red-adlay.com/upload/files/falogamisunelakozugovufep.pdf
    • https://basisangka.com/contents/files/gijudekewulawuvejikijabe.pdf
    • http://zechnerbau.at/images/content/files/8445689968.pdf
    • https://ph789.com/pinhsuan/files/file/51501445517.pdf
    • https://cheesykeju.com/contents/files/80565160525.pdf
    • https://hrmconsulting.biz/upload/files/24078326974.pdf
    • http://rialta.ie/userfiles/files/jemireta.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88f.bin
d6abc20a4e5c591ce8ce699392cb0d55a79582daa530fdfd0022dfb435b5ef08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 17768 bytes
font_01_sfnt_off000106f3.bin
ca730397d537b5a977870354828d44208b072344de06dcb11fb88954431774f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10392 bytes
font_02_sfnt_off00011e42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 16792 bytes

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