Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8a595486ba2347…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 01:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30358f9675682f4011a301d9e594acb1 SHA-1: 544cf79c93626892c6fa6b953750e9e31af6e943 SHA-256: 9f8a595486ba2347c3ed69e613837d08493f7938c4b540c56f0ff73ed07102fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=dictionary+english+to+tamil
    • http://musorcentrum.hu/files/article/file/duwumep.pdf
    • http://obkladlazby.cz/userfiles/file/pawevuxaku.pdf
    • http://aalzkj.love-mrt.com/upload/files/bumorubetezexo.pdf
    • http://reliancefla.com/admin/images/file/gukisexezali.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/mejib.pdf
    • http://wangguanhardware.com/userfiles/file/5038845570.pdf
    • http://www.parinet.fi/tiedostot/files/47468879697.pdf
    • https://dichvuhappyhouse.com/upload/files/95732308921.pdf
    • http://globalone-mould.com/gbw/fckfiles/20210923010034.pdf
    • http://aibrpjoaae2.specialty-match.com/upload/files/zuvijikadilirobigowekidu.pdf
    • https://solener.info/ckfinder/userfiles/files/5744129582.pdf
    • http://murito.fr/ckfinder/userfiles/files/zozezavonimujeva.pdf
    • https://augsburger-dartliga.de/uploads/file/jekemawu.pdf
    • http://bloemenwinkelindex.nl/images/uploads/87163624309.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/99630939430.pdf
    • https://wonkingchina.com/d/files/81062973634.pdf
    • http://libron.pl/fckupload/assets/file/zetajeraxisanatefa.pdf
    • http://thunderstar.cn/userfiles/file/20210903154836996212511.pdf
    • https://kolbandibileklik.com/resimler/files/sebijukitegen.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0f5f0f66---67964900686.pdf
    • https://fajndoktor.cz/images/file/files/31201181414.pdf
    • http://stopguepes72.fr/userfiles/file/62894341373.pdf
    • https://efficimm.fr/userfiles/files/15657210881.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/t15abiq6mkqkq2ie8q45orahob/limulugaripa.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_off0000da80.bin
1448fa36313b1e10001db615572a39754272dd2736d4a7208e474256234d7446		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 10792 bytes
font_01_sfnt_off0000f331.bin
12e780788d404a6d6f66d5be8cb19f3c47344c18e3cc8f5dfd0819ce2d5e22c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 18384 bytes
font_02_sfnt_off000122ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 16792 bytes

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