Malicious PDF — malware analysis report

Static analysis result for SHA-256 3778ca4607610a4b…

MALICIOUS

PDF

62.3 KB Created: 2021-09-10 11:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e8dc0e54f6ae647212a9f64231702bb SHA-1: 722f18ceb71d8ef5bf8dd7051e32bf96d97086ac SHA-256: 3778ca4607610a4b9f18044ac70486f3a60bbd29023c98ccf01cdca193d2620f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to obscure the true destination, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://inwebjor.ru/uplcv?utm_term=gta+san+andreas+cheats+ps2+hydra PDF link annotation
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xexajejobe.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/10665063415.pdfIn PDF document text
    • http://patroha.hu/file/gavagobanuxupilufemone.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/zepadum.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aa00bd1d872fd6e21866ee9123e30fee/magobojopanojujidobepemuj.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/24238563506.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/10447075626.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/15413669074.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/89897422788.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/39303109200.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/505ddba299125253a6887ec65df10e0e/74299540797.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/seresemosenera.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/85284488172.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/52320273290.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/92048814562.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/xanujozipunor.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/fasogulasikavarenolemopad.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/pidugoziti.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/wexefapofazi.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/81363463958.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/degib.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/5212481497.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/81431937596.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/popujomabuwepo.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/33823995564.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 10624 bytes
SHA-256: 853f46281a52bee369a72262d483ae951944b6df76c78013be51421ad73ede84

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