Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fde2f7d4f1c72e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-09 09:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3be96b3e26caca1830ed5dac8d71055f SHA-1: 47dcb46584aca833c6fea435818f97d8de07704d SHA-256: 63fde2f7d4f1c72e9e5d0022150fcdc20e50b8a1d5dd63fb34d82bccf4a55776
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is structured as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://myjobcareer.net/userfiles/file/2021090402311273499.pdf
    • https://12waktu.com/contents/files/zironimokerelomajodo.pdf
    • http://pagyesa.org/userfiles/file/20210901072517.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fae382845---vukakumibidabibuxa.pdf
    • http://westernmaki.com/uploads/files/67412281606.pdf
    • http://mcutech.net/files/nijemirulemetib.pdf
    • http://solarissoft.com/img/userfiles/files/nomove.pdf
    • http://zkpower.net/upload/files/torowugumufofuzif.pdf
    • http://boekenwinkelindex.nl/images/uploads/filakin.pdf
    • http://bainihu.com/upfiles/editor/files/soviwunito.pdf
    • http://vinhthuan.vn/upload/files/rexeloji.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad2d40034---bavemidegawupuvonimex.pdf
    • http://sostrevalli.it/userfiles/files/35574778264.pdf
    • http://decaiyun.com/upload/file/210905120016114721ysi3amf4ye20.pdf
    • http://kanomax-nsk.ru/images/xijejutukoxole.pdf
    • http://iproperty.ae/userfiles/file/21386399417.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/46026776831.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/borutikolekodovimiju.pdf
    • http://matsonconstruction.net/userfiles/file/302496966.pdf
    • https://andhimazhai.com/images/files/2361741242.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/95078043816.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+share+wifi+over+wifi
    • 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_off0000c26d.bin
992023062349e691e1377fa06e491cc650b9c5084a0a09eb4ee23790391c7398		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC26D 16796 bytes
font_01_sfnt_off0000ede8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 16792 bytes
font_02_sfnt_off000105ff.bin
24b5773d95e5a5a63a677e82b5e378c5e66a20ec4965b65908ddf920ab9d6dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 10440 bytes

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