Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2370969005d2778…

MALICIOUS

PDF

86.8 KB Created: 2021-09-21 01:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cedd7b84833cb20388b97cd0cbfb774 SHA-1: 9f2ee1c3a974c824979064bc971d6371d60d375e SHA-256: f2370969005d2778bcf26a6b1fe35da4c19bd020a38f1855b1515ca7570c9133
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • 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.
  • 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
  • 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://fcv-bo.org/data/fcv-bo/userfiles/file/83970999155.pdf In PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210909165443.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/xolejenabobeporupadebi.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/88031963382.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/juwukelugowidi.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/jolunu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/kaxowixakagati.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/dorekusamiki.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/lumuninefiwupap.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/82554954996.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/fepedosijom.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/dukumikujozekowuk.pdfIn PDF document text
    • http://lg-palette.com/upload/files/lebek.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a970d43aff---vufel.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/58117908527.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/fepezodigobaserivoxubeve.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/71530391891.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/newetigifufi.pdfIn PDF document text
    • https://umutfm.com/resimler/files/ginomo.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/bulixagawirunufisabivizi.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/dikuxa.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/baxukibexan.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/sivekovalites.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/82867344193.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906193448.pdfIn PDF document text
    • http://parentini.it/userfiles/files/nilavugowupeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=earn+2+die+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 24796 bytes
SHA-256: 0e17be18a2b62fb71a3dfbd7b58659ac1ddc20a072469480bc715a7900ce4c1f
font_01_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 16820 bytes
SHA-256: ef41c7899d6d111d799807aee77b07311105f5e8d31aafe1c23e31b8e3c2a26c
font_02_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 10084 bytes
SHA-256: 62b65c9e24d442678e70b4631f056e17128898a1e17b5e7174c208cbb74eebb3
font_03_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1