Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbe7022f1a6c3e9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45f59f6fab6d4b6c495ff5dc4f328871 SHA-1: 6e9d35ad957b53dca65dd02cc0feb84bf0f02e77 SHA-256: 8bbe7022f1a6c3e95227a5701d1f86852044e396660416dec6e965861e550c94
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains a link farm with numerous distinct hosts, suggesting an attempt to obscure the true malicious destination. The presence of external URIs and the overall structure indicate it likely serves as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vanlysecurity.vn/vanly/album/files/dirake.pdf In PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/63660791709.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec5073757a287c2d8130a3ea39b1b00a/vufanasukamop.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/mevazezejubebew.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/36619314641.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/kafugebavezofifi.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/81145692828.pdfIn PDF document text
    • http://hueide.com/upload/files/46810205292.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/6852964704.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/13062830152.pdfIn PDF document text
    • https://okazionche.com/files/63334982724.pdfIn PDF document text
    • http://gaudi.tw/upload/file/pajekesasuloxevadopuwa.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/kefifefijumonunanaroxexer.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/wanezererimivadufujuge.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/1061390968.pdfIn PDF document text
    • http://herve-coiffure.ci/files/87636253382.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/gatejede.pdfIn PDF document text
    • http://synergyproperty.com/images/files/tepexemujaxuzofepikuzadox.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/96145322576.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zolevebuwetekonixuxanuz.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/41140299919.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145551414cd0---79807183091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=call+of+duty+black+ops+zombies+apk+hackPDF 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_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 17876 bytes
SHA-256: 41ace58093556ed441b6318536e0c81e6129985738d954d80674e08291239b73
font_02_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 11216 bytes
SHA-256: fedba64007acb95df10913f7f77c13bafcb30199f3560bd756dcc0b90d0af36f

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