Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a61d5028931a9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 17:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00f75c6c58fd37e3d934d7a46679f738 SHA-1: fccf078fbf9f6bbe1df404c264fcb51e513d6a91 SHA-256: 3d5a61d5028931a9e6f0cb04525f60162cf265ecd2a8db301d83facd85a03253
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of disposable URLs, many of which are hosted on domains that appear to be link farms. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • 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://vitalbafitnessclub.eu/userfiles/files/27185294847.pdf
    • https://e-ceramika.pl/userfiles/file/53957071134.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16306288209668.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/nevipevilozosipef.pdf
    • http://kielcenoca.pl/files/file/zipajaxudiz.pdf
    • http://duepassidalcentro.it/userfiles/files/96698035364.pdf
    • http://wangguanhardware.com/userfiles/file/82952118993.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/rerakiwe.pdf
    • http://recit-de-vie.fr/userfiles/file/74591656286.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faec63a0d5---72882587764.pdf
    • http://likebarcode.com/image/files/20210906_223309.pdf
    • http://tavaszitura.eu/userfiles/files/kejolepirexanevax.pdf
    • http://jpind.pl/userfiles/file/7095162685.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/wizawuluzifaxilurekebezu.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210914_C7861AE5FD5BDB4B.pdf
    • http://heorungminhphat.com/luutru/files/valeka.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/7350291398.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/86208602458.pdf
    • http://beiks.info/public/file/31542080413.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/40612154691.pdf
    • http://terezmisszio.eu/files/file/demedepawuxit.pdf
    • http://burbank.kopanramen.com/uploads/files/28302164.pdf
    • https://ikuseikyokai.jp/ckmedia/files/gozajo.pdf
    • http://goksirlambinowice.pl/img/upload/files/zoxigalakebetenas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=imac+stuck+loading+bar
    • 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_off0000d62a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 16792 bytes
font_01_sfnt_off0000ee3c.bin
4f1887bea0ccca28fab56c63691a87b2d522d87d2fbd1f0929c7002f5cbe7da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16472 bytes
font_02_sfnt_off0001190b.bin
c76322a310d1b6c967194b53d49f8f63c3e75c13e9f520286787616dae6bc8e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 10864 bytes

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