Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c25611df6d2facc…

MALICIOUS

PDF

78.8 KB Created: 2021-09-11 16:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3876b33b54dd87ebadf0e557c26a55ac SHA-1: 350b81ee04f95ad8bd3159947d938acf82a38351 SHA-256: 7c25611df6d2facca801256d4ac5ae12efed1018004880f418f8634b7f500757
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=driving+game+offline
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/43454986936.pdf
    • http://proxima-online.it/public/file/19682477130.pdf
    • https://akproauto.com/nbloom/fckuploads/file/nerowokoratisobope.pdf
    • http://hotelbasantresidency.com/uploads/35117939418.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161314deb54867---janugudalam.pdf
    • https://bilegt.mn/userfiles/files/boxas.pdf
    • https://hotelharmika.com/assets/userfiles/files/4519681332.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d501e1161---48738019718.pdf
    • https://miet.hu/kepek/nepegapavuximadeje.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/mexubasewoxalikaja.pdf
    • http://asbu.net/uploads/FCK_files/file/muwoj.pdf
    • http://flomojapan.com/upload/files/duwazujagijuj.pdf
    • http://dakdekkersindex.nl/images/uploads/73159701675.pdf
    • http://artepcb.com/upload/files/diparugifakovusozobi.pdf
    • http://nigerseedindia.com/uploads/10909186165.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/69450738573.pdf
    • http://dostrojar.sk/UserFiles/file/93539079123.pdf
    • http://polyalpan.hu/_user/file/jatix.pdf
    • http://zafirkort.com/uploads/files/53295453570.pdf
    • http://newworldss.com/uploads/file/78560304079.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/57068969299.pdf
    • http://geofer.eu/userfiles/files/gekod.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_off0000d2e4.bin
fde7c5ef4a796e0c38141b9f8c6b5cc69626b45e1fedeede11e7647a4dc7891f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 16964 bytes
font_01_sfnt_off0000fec1.bin
3c53b48176f0561fa89020cdd54f30e5c5e3a9c2d0b346b0fdbc76e5c1d5fd70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10360 bytes
font_02_sfnt_off0001161f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 16792 bytes

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