Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f6bd179c11cabd…

MALICIOUS

PDF

93.6 KB Created: 2021-09-24 11:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: effa43b68e281eeb4c9f9c69241dfdca SHA-1: e3317f89891689d0b353b233059ed59d8c6816d1 SHA-256: d6f6bd179c11cabd26dc72a18530f9fb93a7447292d694dd9c6c204aa58609bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to potentially disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://vietkinggroup.com/uploads/userfiles/file/subefujinaferorisoj.pdf In PDF document text
    • http://tokyoracing.hu/userfiles/file/41063050619.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jidisowinabe.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/zajulinaxaretapafodalikiw.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614495e000189---80714351514.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/46365012744.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/lowewafulowutelakuw.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/nomegesavetotugi.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/41252537027.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c813683cb---76473633985.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/ronebusevutovove.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/85836698041.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210924_B91CB5913523D414.pdfIn PDF document text
    • https://gencatakan.com/upload/file/dimosoneratajamikeb.pdfIn PDF document text
    • https://labelmarket.eu/data/file/98543768736.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/jumaxegekelu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109090924298403.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/54853699500.pdfIn PDF document text
    • http://toroisg.com/public/images/files/wixisaletivijuxezavamako.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/36203984248.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/ganadijekike.pdfIn PDF document text
    • http://espokebar.com/uploads/files/zugewolewomobizepiniza.pdfIn PDF document text
    • http://dfanchem.com/upload/files/84440878257.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/neboxolu.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/zadonoxuwewekezawesup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+dune+1984+movie+freePDF 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_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 11192 bytes
SHA-256: 953c395f89d773e2718fe73bee250e14618a084cc7079002ce8a1dd55b633152
font_01_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 20284 bytes
SHA-256: 8988dade501d99b52e5a94d301a6196952a6e6e0f307f9d799dca0ecf185e896
font_02_sfnt_off00014f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1