Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d86ad9809f0adb…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 05:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f131efc320bd07672095b4fba378a4a SHA-1: 1efece7cfa7a63f9a874b64c119b52ce636bd509 SHA-256: c6d86ad9809f0adba9ef256dcf13ac0152c02704380d5d732924559c15c47c1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to external sites, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=cheat+ml+injector
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/15395307467.pdf
    • https://negaratoto.com/contents/files/rizeverozulekuzos.pdf
    • https://olterus.org/contents/files/pexugirazefosesuwe.pdf
    • https://vhcvietnam.vn/ckeditor/images/files/satomejivonitezezavenaz.pdf
    • http://cocoon-source-harmonie.fr/public/file/85350374364.pdf
    • http://qualityspices.in/ckuploads/files/41357397267.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace3d1092a---juwidezonokejojefabevuta.pdf
    • http://vaithun.net/upload/files/puburusobuwazabof.pdf
    • https://hippodrome-compiegne.fr/www/uploads/file/64474430885.pdf
    • https://novahealthclinic.ca/userfiles/file/sojomeviwiwomupuwinumawim.pdf
    • http://tangiahoang.vn/Images_upload/files/febufulozunibubepo.pdf
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210919132334.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/tutijapobikiketetobone.pdf
    • http://tarnava.eu/user_images/file/43042487199.pdf
    • http://www.grifin.sk/files/xevazowasabidori.pdf
    • http://thingsantiquesla.com/userfiles/files/27524296737.pdf
    • http://biolabsrl.org/userfiles/files/19227311581.pdf
    • http://pm-ural.com/uploads/files/faruwesuvazewufawumodinuv.pdf
    • http://www.greenfield-sustainability.com/images/files/40373959431.pdf
    • https://coastalstudio.com/images/main/file/jowopuwililesopibuped.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/resinajef.pdf
    • https://groupburuemas1.com/contents/files/51975601587.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a38684aa1---53391264788.pdf
    • http://kovofilm.cz/userfiles/file/letijapovop.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_off0000b1fa.bin
6afab1f90b270903c6535917fc14f6b6785ec3733b52cb745e31c2e84dd05d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10488 bytes
font_01_sfnt_off0000c98c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 16792 bytes
font_02_sfnt_off0000e19e.bin
02999d7862e939592ca7b695216523aa3138daa88485112be990a1d98d3f6852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 14964 bytes

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