Malicious PDF — malware analysis report

Static analysis result for SHA-256 906a89e55fcfc1d7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 13:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c5fc7dfaa4c76862529bdf097ee8b02 SHA-1: 58555170e04ab28e55b0951f2df42e74224da492 SHA-256: 906a89e55fcfc1d712f30784b4bda1c469b083a30f93f35f79843789108ae150
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with high heuristic scores indicating it functions as a link farm. The embedded URLs point to various PDF files hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious intent.

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 https://playindiano1.in/ckfinder/userfiles/files/73716400107.pdf
    • https://swapnauraan.com/ckfinder/userfiles/files/dukilup.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/37218761390.pdf
    • http://minhanh.com/files/fipotojisekupikopowew.pdf
    • http://filtrydokoparek.pl/img/all/fadoladi.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7efc33ad---41939776949.pdf
    • http://nuuts.mn/uploads/assets/43607383497.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210907_695887820BE14C73.pdf
    • http://herve-coiffure.ci/files/28505808219.pdf
    • http://debeight.net/UserFiles/File/51553928030.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/87929570931.pdf
    • https://myclubowners.com/userfiles/files/pojaburarapewozedawuwero.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/74297011583.pdf
    • https://responsible-tourism-alliance.com/content_file/files/45508588328.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/2952804342.pdf
    • https://resulgame.com/calisma2/files/uploads/26891401617.pdf
    • https://appchecar.com/ckfinder/userfiles/files/28465207064.pdf
    • https://prosaison.fr/userfiles/files/galixofakapiv.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe29a85e98---xiloguvuxupuvakutun.pdf
    • https://aitalk.vn/upload/files/sedogukux.pdf
    • http://edbiji.com/uploads/files/20210902033758_997295.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/38805180415.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/xanugifogutifepesofiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ar+verbs+in+the+preterite+worksheet+2+answers
    • 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_off0000beae.bin
ee9b524112224aaeeffefb34debc59f6d201c8736e08091e60967545e59321fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 10788 bytes
font_01_sfnt_off0000d769.bin
6ad6435e50c4927baead4e0bfc228259f851758c353cfcc8711fce686382b5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16832 bytes
font_02_sfnt_off000102fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes

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