Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb20a92e531e71b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 15:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e8c38edad3bbfd4f23cbf2052824dbe SHA-1: 592653606411e6d51993187ce79a726fbb747cf5 SHA-256: beb20a92e531e71b565ce7f09b2bafa24a56873865072e9a35cd78158448231a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://karlsbach.de/userfiles/files/17568456412.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/35141048982.pdf
    • https://santa.my/images/users/00000000/files/sivolupeziximimovivafivo.pdf
    • https://aordonez.com/images/contenidos/files/davoka.pdf
    • http://primeasset.hu/fileok/file/zepanekubilezivew.pdf
    • https://mabuksusu.com/contents/files/41800766665.pdf
    • http://ateliergermain.net/sites/default/files/file/11657936277.pdf
    • http://conditum.nl/userfiles/file/luviv.pdf
    • https://unchiulmihai.ro/files/fckeditor/file/28970288024.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/vibimadejis.pdf
    • http://musicandyouapp.com/webupload/editorimg/files/disazakedenoxowizewaxalap.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/temamisax.pdf
    • http://lica-mpt.it/userfiles/files/tulow.pdf
    • http://likuidart.com/files/ckeditor/files/netezazaxos.pdf
    • http://bjxbw.cn/userfiles/file/34165947859.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/befubapuwufabuzefuleri.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/juroparufodilikik.pdf
    • http://aaz.sk/editor_uploads/files/58524694749.pdf
    • https://wickedcheesy.com/images/file/sotanoko.pdf
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/juwasinadolap.pdf
    • http://kursadowicz.pl/Upload/file/gugodafakarenirimabidabow.pdf
    • http://group-anons.ru/userfiles/files/80899595134.pdf
    • http://dspec-car.com/js/upload/files/kebusudazuxabawileri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+delete+cookies+on+android
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0ca37f16e---21017986666.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_off0000b088.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 16792 bytes
font_01_sfnt_off0000c89f.bin
38ab026e2ff88c814c5815887e2e4dcc313cfdd11fc579f0cf6f7ccdcab1bb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 10532 bytes
font_02_sfnt_off0000e0b8.bin
2c1f5958d064af469fcc74b40f67f0f52c2f59cb408fa596e6d6c3074b1efb60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 17156 bytes

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