Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d83871749200e5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c21d849232f5fda82c4ddae09d32a9b5 SHA-1: 67146686cc44f75eefb6f1850a2b93b1c9c11183 SHA-256: f6d83871749200e55b3265a08ac9e6570d3d7f687b2486a9f62c8805efe12d17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host phishing content or further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of link farms on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://afro-safari.com/upload/files/feviduwesejo.pdf
    • http://tc-antey.ru/uploads/files/29715795696.pdf
    • https://alkirbilaw.com/userfiles/files/94072861484.pdf
    • http://jfe.hk/userfiles/gujoxetuwuxumil.pdf
    • http://vipacademy.org/userfiles/file/gabakor.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74042360828.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210910_EE32798F4DDAA79E.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53f888489---8315844287.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396a388ca34---pudaf.pdf
    • http://zetrade.cz/userfiles/file/77903765611.pdf
    • http://mulroyenvironmental.ie/userfiles/file/rujotiwatabakenatogoma.pdf
    • https://dla-pracownika.pl/pliki_user/File/56975229915.pdf
    • http://globalbizkorea.com/userData/board/file/mujiwolig.pdf
    • https://m-astar.com/UserFiles/files/16093559729.pdf
    • http://spain-ex.com/images/blog/file/99612064759.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/xilatin.pdf
    • https://hurghadalife.net/userfiles/files/lonevoxarigixunufam.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/deligaruzodibodamikibilur.pdf
    • http://softtox.pl/new/userfiles/file/98923583917.pdf
    • http://teleinwestor.pl/userfiles/file/zaxatavuropefe.pdf
    • http://ngor2-3.com/file_media/file_image/file/fejimewapojerunixa.pdf
    • http://grandviewgroupresort.com/upload/files/pabatotinuleduvaduweb.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/zobasidevigegaxite.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jivosubumupofagakawisu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=first+aid+step+1+pdf+2020
    • 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_off0000cf73.bin
8e8794666cc08a45ff3d1d971e18bbcd4216c01a4cc536d1fb4642e11bcb17f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 10492 bytes
font_01_sfnt_off0000e77b.bin
8808f572b11f46a742bb3f0901c8402a8b1050da078d303ebca174bf2709a14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 18664 bytes
font_02_sfnt_off0001175c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 16792 bytes

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