Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf20b0a7b329601…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 17:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94c3fbc7acb2337139dc7d2db60dbf62 SHA-1: 47e69fb916c7bcded9d11d4ddbecf9701349396e SHA-256: 0bf20b0a7b329601ad71dcaa72f4353a9ca30009ec90c9b95f23e2c2eb509aeb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm, directing users to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://kimwendelldesign.com/ckfinder/userfiles/files/57932071835.pdf In PDF document text
    • http://sjccgy.com/userfiles/file/kelujij.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/91488219284.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/32119064978.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/pejumuporedemu.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/18172964723.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136472ab74fe---talepojoda.pdfIn PDF document text
    • http://mestan.by/images/file/wovix.pdfIn PDF document text
    • http://emannsltd.com/userfiles/benasekokewekuzukojobotov.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/27000151357.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/dutamivovifuka.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/kijibepisu.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/42438172921.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/63836385135.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202195101436147.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090704561370554.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/leronapurapunoxevibanago.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/94835470024.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/39166649126.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/55620720264.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/68858012135.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/roniw.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/kamufajezijilunewas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=john+wick+2+dual+audioPDF link annotation
    • 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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 19568 bytes
SHA-256: 28982c39b61751bb5291e00d4dd8b582983b039e2bc1c79c249c7061255e592b
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 10356 bytes
SHA-256: 75aef7e4c2b9ecc893964ca9a1e4a8077166c64271f8c55747f31f7c53c72909

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