Malicious PDF — malware analysis report

Static analysis result for SHA-256 8307e8a6e65fdffa…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 00:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8b92907009e369746085f168f21247a SHA-1: a675ac03efca4f6d8f508584a599850be661c0d5 SHA-256: 8307e8a6e65fdffa7675d216188c09c2ff03d8fb7e2d3568224be2775a597e4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kantipursecurity.com/userfiles/file/vogimevup.pdf
    • http://sziszolg.hu/editor_up/63661799153.pdf
    • https://windfreeklima.com/upload/ckfinder/files/papanix.pdf
    • http://bbmeti.it/userfiles/files/97739295161.pdf
    • https://skywaynepal.com/userfiles/file/wovawarudupovojifefofu.pdf
    • http://hoshitorionline.com/uploads/files/sekinuve.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/rokusomugozimopagunama.pdf
    • https://millersexpress.com/userfiles/file/bukunikuberewumuvitizamig.pdf
    • http://mazdooradda.com/userfiles/file/bededi.pdf
    • http://aweibel.com/Photo/file/36295445454.pdf
    • http://oilspecchem.com/files/vuseba.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/82322327973.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc8077a49---36596299299.pdf
    • http://micruts.org/userfiles/file/katol.pdf
    • http://tonioloclaudio.it/userfiles/files/pupito.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/dugefuxuvixolet.pdf
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/fovamovanu.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b75e7b9250b452ea99349c1456eef71a/vopubimorukesek.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/694109190.pdf
    • https://stw-nowogard.pl/download/file/xavikizilivufubekutujuvu.pdf
    • https://aaaxxion.info/images/file/19490341419.pdf
    • http://weighlessthisyear.com/ckfinder/userfiles/files/84783220730.pdf
    • http://pitin-akutsu.com/js/upload/files/65725810113.pdf
    • http://merwepizza.com/upload/file/31581070030.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+master+download
    • 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_off0000d439.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 16792 bytes
font_01_sfnt_off0000ec4b.bin
7dcac59306383821588a6dabab6270666bf64c07b1b7d2c5a3a621597870ae10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 18524 bytes
font_02_sfnt_off00011c77.bin
56a1dd262ca5d2e81314cd19fabdc7ecdb5b5c4b076fa72c363171f2594da0bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 10496 bytes

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