Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d1f2ae2c66ca7c…

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 15:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a944d5fb9cb1d0a1dabce8c662f3aa6 SHA-1: 0888619a77cc91a786c4d8c24bab31f58ed57bf5 SHA-256: 38d1f2ae2c66ca7cfa3671206c9dbbb43023f5822ff7f925c7950c529a5f0e99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://salman-is.com/userfiles/file/tamapasoripolegaki.pdf In PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/46730552235.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/wijixigarideduwefag.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/rezegotofidivewepe.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148dd62b98be---71618888754.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/livalosokolajafejexazevor.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/68210066004.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/67846986884.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufok.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/girego.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/82744551935.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/15785430357.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/dipinu.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/pebomuf.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/woturubalilisozemukejisub.pdfIn PDF document text
    • https://lordoptika.hu/files/files/8054292884.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912095650122597.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/87843445091.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/87799801913.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/butisomomiwizinapapanufa.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/19543353277.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/18397748468.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/94697763676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+run+windows+programs+on+linuxPDF 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_off0000b83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 16616 bytes
SHA-256: 5645c802a2a8cfca7cc4ce41083398aec9589f835d860ccd27b5b08d249be78a
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10884 bytes
SHA-256: 21153c6c691cd8058e1fef47caaeb732e27430eb32b9842147665c9cbdcd3ebc