Malicious PDF — malware analysis report

Static analysis result for SHA-256 1548d640147453cb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 23:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db14f66c4c2e61707bc40869cf0a41d0 SHA-1: cdb8bf6642f751b437aba37f89457bc220a83538 SHA-256: 1548d640147453cbd193e5892a8a398b76b27a8132bacc45e4289477d44c8f24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=infinite+flight+simulator+hack+apk PDF link annotation
    • http://aczelzalog.hu/tmp/bezemosuj.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/towenedek.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/vofebapefe.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/kutapubipamuzutot.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/kigunotan.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/64583441021.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/16907334394.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1356dbad8fb02f7f0803477f48f6ebb7/35078274934.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/19905361790.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jevinifozin.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2bf592a6---wetekezezolinug.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/xateniropivurene.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/tozazuxofofuta.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/xilotu.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/6416897571.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/valibefewadedifesu.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/80111771862.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/75823468781.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///panubofe.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/10781164119.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/72254374694.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210914074534482996.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/48597251005.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/31704570835.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_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 20820 bytes
SHA-256: c88c350ea06ba6d455b82c4c83fddc5b5701cf2208ac554e850c1a66898a1c99
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 11072 bytes
SHA-256: e9b7e3ac5bb852192e6547621955faf0d6acb2eccc7f3ab1b7fef26ae9860a27

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