Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0665359831aec0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 23:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09db9d86be855aa285dbbaf4abeee521 SHA-1: 3f3845e89e8858d7e24ded823e34c02b7a0770ab SHA-256: fc0665359831aec0e4fc87c597cce00aa4a3c54bd25e8722ede32620c3163cd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF's nature strongly implies a malicious intent to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=how+to+watch+mirzapur+free PDF link annotation
    • http://egitara.com/upfiles/files/vinanez.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/95680766081.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/babixazapewif.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/sivesobad.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/sirajira.pdfIn PDF document text
    • http://chengzechem.com/upload/files/momokodafasawujawa.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/35727916454.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17911378363.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/3136283585.pdfIn PDF document text
    • http://test-immo.com/file/bagevom.pdfIn PDF document text
    • http://mousike.it/img_ins/files/33502725967.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/nezurodasizosexunes.pdfIn PDF document text
    • http://duef.ru/public/file/94256623171.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/56619304739.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/76927648213.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xusizixetuwufozo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336fde8d9f---79765258263.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/zelajetajexojad.pdfIn PDF document text
    • https://autoskola-scp.com/files/9666301185.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/jilelowugotegigumoz.pdfIn PDF document text
    • https://digireg.it/upload/37595620931.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/20024219757.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906061429.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/99130177185.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/gokuwikigewuvitesemabimif.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/1296618683.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_off0000b172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 10664 bytes
SHA-256: 01d72211a3c23962eb52311942e10ac9a9c736ae1590c7e0df983f96fd91f37e
font_02_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 16224 bytes
SHA-256: 58e1c359dacfc7e17b33877361e05e48dec275582b3f574c1b53841668bbb692