Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f85bd8de12d9a53…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 885b2d49780d85e56e6bde8cf0d5cc24 SHA-1: 40a1fa422333a6e4e677653d4dc6f41b81dd7879 SHA-256: 1f85bd8de12d9a53cfaec177350d2201b9938e3599f9496882c7d8b66f70bd02
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 hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded JavaScript is a common technique for executing malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=budidaya+kumis+kucing+pdf
    • https://zenmobile.in/jaipriyart/uploads/files/lafesabibupalav.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/fabupovafu.pdf
    • http://paolacaone.eu/userfiles/files/befulexetasowaso.pdf
    • http://train-in-japan.com/images/blog/file/49782254407.pdf
    • http://harryreichert.de/uploaded_pics/News/file/44130969007.pdf
    • http://e-park.es/img/uploads/files/fovivasodisa.pdf
    • http://www.dereformasenalicante.com/archivos/files/xuregabigijof.pdf
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/legetukisuxuze.pdf
    • http://unionnutritech.com/upload/files/20397629680.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/64351161083.pdf
    • http://z500.si/files/fokikubikim.pdf
    • http://qdsenfeng.com/data/files/bawuxemetixine.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6bc3d869---sivigujep.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/2635205983.pdf
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wojubomazuji.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/45099864009.pdf
    • http://mfcpavpos.ru/file/59073507457.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/zuviluf.pdf
    • http://ks-system.co.uk/ckfinder/userfiles/files/15971884153.pdf
    • https://nikosdimos.gr/userfiles/file/58273892462.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007dc4bfd6---wosiroxexutaxos.pdf
    • https://giritrademark.com/content_files/files/37495650420.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/zonikogadubefadolisokulin.pdf
    • https://aymsoft.us/aym_image/files/livoz.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_off0000cb35.bin
78234635b9e1bed19f69eb887c25701f8cd8ef956e932b405d32044eb55b5557		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 10828 bytes
font_01_sfnt_off0000e407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 16792 bytes
font_02_sfnt_off0000fc19.bin
32cfa1e61c3632537182daa6e4dc9292e665c555919cc2d8e5c0ff544a59a189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16472 bytes

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