Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99658cf3a17ce30…

MALICIOUS

PDF

70.0 KB Created: 2021-09-21 22:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebcb6d9ed7d8dd3f7d2446cd6292153e SHA-1: b958d3b7155992cb702932004d150ed747b88e06 SHA-256: b99658cf3a17ce30a2e06f454a8247fa265be18f894c0e9c9c926b7c7e09af24
134 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a significant number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by highlighting the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xoredegubelonivagonadan.pdf
    • https://unique-u.biz/images/uploads/file/21068174598.pdf
    • https://drlalashow.com/php/billboard/uploads/file/81122987847.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/filelibejotibo.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/99393337834.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/57152204639.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/92508562772.pdf
    • http://dallapietamarchisio.it/userfiles/files/83230921340.pdf
    • http://allasclub.com/campannas/file/59909369937.pdf
    • https://specialgarden.ro/userfiles/file/5220642936.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/kalukixuxigolapoxavazijom.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6164700868.pdf
    • http://pospatrans.cz/UserFiles/File/19309333063.pdf
    • http://www.ap-arte.ro/fckupload/file/xokumuguxukabugit.pdf
    • https://conviviodihera.it/dati/upload/file/nifinesuviwibaxosamaju.pdf
    • http://amphorabeautyclub.com/campannas/file/40886535914.pdf
    • https://www.corpeverest.com/ckfinder/userfiles/files/94680407072.pdf
    • https://badeluxe.com/userfiles/files/mobemapusoxekefogo.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7da9f994---93838249722.pdf
    • https://mastirz.com/userfiles/files/43232441444.pdf
    • http://seamcc.com/UserFiles/files/fuwosexu.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/74272715633.pdf
    • http://osmed.cz/app/webroot/files/files/jujuxadokibezosujina.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=historia+de+la+personalidad+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_off0000b3a3.bin
d095be761b5e9830b832bd47af3bcdd09b90e76a0b76f2eb4f499712f2aeacf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 15608 bytes
font_01_sfnt_off0000da3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 16792 bytes
font_02_sfnt_off0000f254.bin
67d2cd659c19f6011a4ec642eac9c56b67d2c175c087a9ed2e56bce6c251ff7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 10480 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.