Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c53c59f7c1066ee…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 05:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf69d5ea900e1cfd361ab716a0ef2ca4 SHA-1: b2116718ece68998504e35f659a2a604b070967a SHA-256: 0c53c59f7c1066ee8b1a8db3a3a3c6d666443cc0ff084b065a9846e43d462f53
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, which are indicative of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination through a network of disposable domains. The ML classifier and ClamAV detection strongly support a malicious classification, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=tambah+bahasa+di+android PDF link annotation
    • https://horkolas-gatlas.hu/ufiles/file/rabalirowuwexumusaluveze.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/sebikozovamejuwoluwekik.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/lepun.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/59391280614.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rizimoj.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/fizudumotabi.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_105657.pdfPDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/17541962751.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/28796468411.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/gewasurikifavepatuzebenik.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/67441009510.pdfIn PDF document text
    • https://edex.co/userfiles/files/97260476956.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/gosetifatifo.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/zarunubavit.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/zudupufeza.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/pizuwovugokatanugitena.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/majodanugosed.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/64503421491.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/pomubomijo.pdfIn PDF document text
    • http://phm.vn/upload/files/kebimofokokefulikefuwaneg.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613896e2cb492---gulusekexejibanilixokosud.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/nibogipaziwurezixixunimo.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/59558478812.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lowiselabatu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16928 bytes
SHA-256: 7476f7def8f5e16832f691d413ff99256c6dd031f4ced3615dc6147a757bd526
font_01_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 10340 bytes
SHA-256: 90743be0e53a82194fcbd45525645751eea973441a60e61b819b8224eefe35c9