Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a040779a0c6736e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 23:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f628c57827c0314d0c83ff7559778b8 SHA-1: 7a523f4254467d3e7e4111d6ce8bda44429d5bc8 SHA-256: 9a040779a0c6736e9d033b3f2665fc91de6673aa9022dd1144f3b8bfd5b0868e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to direct users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this file is intended to lure users into clicking links, potentially leading to credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/uplcv?utm_term=marvel+studios+assembled+the+making+of+wandavision
    • http://tizianaiberti.it/userfiles/files/3042462883.pdf
    • http://dblbtech.com/userfiles/file/99728414921.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/659d90392cf1d8c768111186cc576997/rejatowamudarozeloseva.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f917b6bdf---64020115180.pdf
    • http://cleanking.net/userData/board/file/zutepa.pdf
    • https://gruntbudowa.pl/files/file/91981452535.pdf
    • https://kfmaccounting.com/webroot/img/content/files/gibilelisosirotuki.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/81111999588.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210916_75342DEC16C03EDC.pdf
    • http://bluebossa.pl/files/file/gozusizojifanitogavazi.pdf
    • https://takarasushimn.com/userfiles/files/fuvodarilinewuduw.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/86773086312.pdf
    • https://mudraconsultancy.com/uploads/files/79956627773.pdf
    • http://adamlegal.com/userfiles/file/33474091366.pdf
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/34034643114.pdf
    • http://najlepsietorty.sk/uploads/fck/file/72992832569.pdf
    • https://ezokniga.com/uploads/file/gisitizerevirisime.pdf
    • https://etcbt.com/userfiles/file/70531603668.pdf
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/21078032501.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/86905720037.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/57385366320.pdf
    • https://xn--atpta-nfb.lv/images/userfiles/files/zenapawunuzemubojug.pdf
    • http://hrudolf.com/userfiles/bibesotazeg.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_off0000e2f7.bin
3053ebfa49e5829b540648e83ae68f6c0db27a17a33c6689ed6a1077e6d3291a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 11280 bytes
font_01_sfnt_off0000fd1a.bin
b97e0a923da1c0c9a4480d003db8412fafdbcf8b7c524dd9e7e882645b5a480e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 18660 bytes
font_02_sfnt_off00012e6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 16792 bytes

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