Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c24b8ad295eb344…

MALICIOUS

PDF

101.7 KB Created: 2021-09-09 04:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a33e0d7e3120cf5dbf096818bc519a59 SHA-1: cc0a168536652c72e911d526cf424a08ec694b99 SHA-256: 6c24b8ad295eb3440a39f74c88bc09415d2b0ccb84b9bbff2175141fd2c9eb6d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a password-protected archive lure. It contains embedded JavaScript, suggesting an attempt to execute malicious code or redirect the user to a malicious site. The numerous external URIs, many pointing to disposable hosting, further support the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://whuntex.ru/userfiles/file/fukolesugegotetokixo.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/87158174366.pdf
    • https://towa-aaa.jp/userfiles/file/36177876238.pdf
    • http://aqs-group.it/userfiles/files/50931255022.pdf
    • http://shiinamotors.com/js/upload/files/mamunafulikobude.pdf
    • https://piphoto.tw/uploads/files/202109040423133162.pdf
    • http://baracenter.be/userfiles/file/zomividibejareb.pdf
    • http://zbigniewrodak.pl/galeria/file/mixugukemalipazewixepavu.pdf
    • https://businesslife.com/content/files/10473746892.pdf
    • http://yomamasushitogo.com/uploads/files/wulenebezejawarularejo.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/25600656796.pdf
    • http://chayka-svg.ru/files/56117900039.pdf
    • http://saiprogetti.net/userfiles/files/31924688143.pdf
    • http://aihyang.com/userfiles/file/77103354238.pdf
    • http://prmakeup.com/Image/files/pejuxetexuxu.pdf
    • http://bowie.abwingsmd.com/uploads/files/2273257942.pdf
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91788984841.pdf
    • https://episcopiaoradiei.ro/files/sekidupuxovi.pdf
    • https://xosobacninh.vn/webroot/img/files/55156661215.pdf
    • http://dichvumucin.com/upload/ckupload/files/12317981590.pdf
    • http://deeringbayrealestate.com/userfiles/files/fapezusemukuzujuze.pdf
    • https://rpaxis.net/userfiles/file/55275006665.pdf
    • http://cablexconsulting.com/Upload/file/97697106370.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=frankenstein+original+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_off000125e2.bin
c823165de61faea4b1e44bb96f501083c54e54fc10ef0e201964c2f5551506a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 10740 bytes
font_01_sfnt_off00013e70.bin
5fd37a794e03699299e6b3849270a38d28dd0de2d60ff09e5d59f19bd789fae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E70 19200 bytes
font_02_sfnt_off00017118.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17118 16792 bytes

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