Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b595104db9b226…

MALICIOUS

PDF

109.7 KB Created: 2021-09-21 11:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bb566fa6316089acd8d45e753c46d63 SHA-1: 6870c829bcc4acbe5c9400ce19517804ab8abc50 SHA-256: 66b595104db9b226c34b502b7a6e7d1d20d3a7b31cd4235148cca65e36ba4363
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to interact with external resources. The 'SE_CLICKFIX' heuristic strongly suggests a social engineering attack where the user is prompted to execute a command, likely to download and run a secondary payload. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pixomot.ru/uplcv?utm_term=block+video+autoplay+chrome
    • http://xyr59.com/filespath/files/20210913232625.pdf
    • http://beastyenergy.com/userfiles/file/16801626925.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/pamixoderomivuvazekogu.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210901230812.pdf
    • https://apra.pl/files/file/sujefenagimesovibedi.pdf
    • http://fosterfreezesantarosa.com/uploads/files/46325549988.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/vejunovakibepoletuwemaw.pdf
    • http://vers-ma.de/userfiles/file/55816567238.pdf
    • http://ajisushionline.com/uploads/files/wajoxokezizevibewavare.pdf
    • http://pluimveebeurs.com/userfiles/file/nitari.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514868eb78---56981455636.pdf
    • http://pillshop.ru/uimg/files/9357891879.pdf
    • http://matsusushionline.com/uploads/files/33235529360.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e2c7a5011---85762634811.pdf
    • http://hwayinn.com/image/files/20210911_001011.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/25531727864.pdf
    • https://tedvandergulik.nl/userimages/file/jejid.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zitibega.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/resexitupewi.pdf
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/98580518058.pdf
    • http://all-vehicle.net/js/upload/files/80352768378.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_off00014657.bin
6ae751eeab43f962cf27090ba074d7247eb0fb8d876e35a9c457d3a64bdc1e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14657 18988 bytes
font_01_sfnt_off0001778a.bin
3d9793f8ae314a34694abc7659a998a32c3c2007a31e73d45f6062e5968f0be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1778A 10932 bytes
font_02_sfnt_off000190f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190F1 16792 bytes

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