Malicious PDF — malware analysis report

Static analysis result for SHA-256 08713280abc6b8c0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 23:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4658b9fed537724fd1acb38481c08b87 SHA-1: c081ad117381f9961de3e48e956f3e9ee2b06fde SHA-256: 08713280abc6b8c079c4ec9039f751f58c8cc332a9f7e443cb8527ff77f662b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely disposable and used for malicious purposes. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=naruto+shippuden+ep+283 PDF link annotation
    • http://studiorestagno.eu/userfiles/files/50104820638.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210918_101020.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/2633782472.pdfIn PDF document text
    • https://shibbirs.com/media/files/21788072574.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/rumatedazutuzipu.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/supufawire.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/41286377291.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/1160766534.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/joretimitolume.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f219663f88---terusiwewunoluk.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/3220192344.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/50449430170.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_000459.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/86472100858.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/bimimakunome.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wegisugemu.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/73894952442.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/jopatoleminuxatoli.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109160046396723.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/43982658454.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109031400463641.pdfIn PDF document text
    • https://theipbuzz.com/images/file/xisogefejaze.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_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 11020 bytes
SHA-256: a95473b1f33e547aa937b0cd4f44e9fae2a2666ad0b582f08cc34010e7021deb
font_01_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 21460 bytes
SHA-256: f0a57a8364211b3203ba6def1068df27cb6d19f919b47066269468a9ebc4ca12