Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a59de8f4c254d1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 13:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c86942c60a5db494449ac8db1a649ccf SHA-1: 94e8fc07467868e95bc4bf8c2b6f0008065de9a9 SHA-256: b7a59de8f4c254d16992a792a58aaed0bea5083a978cf1c755bf0ff372c7470a
134 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination, a common phishing or malware distribution tactic. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://accu-split.com/userfiles/files/zowonoginemewavara.pdf
    • https://vozilasavozacem.rs/files/6391723010.pdf
    • http://www.medicellbank.com/userfiles/files/76756727912.pdf
    • http://kukdae.com/files/fckeditor/file/gososet.pdf
    • http://savytrading.com/userfiles/file/49521028930.pdf
    • http://kawana.tech/userfiles/file/tebaxaposimipafa.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/42070969186.pdf
    • http://www.gobarging.com/uploads/textareas/file/nesitebuw.pdf
    • http://sinoorchids.com/image/file/xizoxuwele.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/nizatedodi.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/gupugixizominolobepezef.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd43ba327---doxodovusabiguwuloroni.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eef6b8613c---99992325664.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/96783789791.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/fefozasodilarelubexam.pdf
    • http://snieznik.pl/userfiles/file/famepo.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210908_CA8BE47494C9DC2E.pdf
    • http://metaglas.kr/userData/board/file/73510297056.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/wileget.pdf
    • http://119pump.net/d/files/99017942522.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/nelokelitipawiv.pdf
    • http://ctkupavna.ru/upload/file/retazamaxugaxasugowuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fascinating+womanhood+free+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_off0000d323.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 16792 bytes
font_01_sfnt_off0000eb3a.bin
d674007b0ef04cda13ed38ea558a4218879ab343012714464c74f317f0dac981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 11084 bytes
font_02_sfnt_off000104bc.bin
3db5f4bd3f983e06fb3b1e4b8758d57d206f71fbfe553e5fa5da62be0b6edb25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 18204 bytes

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