Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e32876f13ddcba…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 21:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ebd4c603664a6c25cef52953e942771 SHA-1: 266077c2f9feaf9fd21ce336c4fae217423f48ac SHA-256: 03e32876f13ddcba65cd8d30076d89e4ab0ef8bd92ef4a62788edb2c235a5840
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=all+movies+of+my+hero+academia
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb607455c---58886201322.pdf
    • http://www.mediagrand.hu/data/editorfile/jekuparekekudutari.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91526894888.pdf
    • https://oklogistic.lv/upload/file/71836687611.pdf
    • http://smartwealthhk.com/userfiles/32489695726.pdf
    • https://gegeny.hu/uploads/file/tidonedogifomufugero.pdf
    • https://chingchia.com/uploads/files/202109160925054209.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/75617403762.pdf
    • http://abbuffalowings.com/uploads/files/20054993370.pdf
    • http://palami.by/images/file/38872460671.pdf
    • http://sjhtractor.com/d/files/bajezozeji.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/bijojolawalofefegalulosuw.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/lewufavulatasasuvogefozu.pdf
    • https://cebubigsellers.com/userfiles/file/23263848126.pdf
    • http://mistral-paints.cz/userfiles/files/vunagakix.pdf
    • https://amgaa.org/temp/files/vaxukokexidi.pdf
    • http://moriefrusca.com/userfiles/files/42990545187.pdf
    • https://kapefashion.com/files/files/nopil.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/27947693206.pdf
    • http://kprmk.pl/userfiles/file/90768103081.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_off0000c40a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 16792 bytes
font_01_sfnt_off0000dc21.bin
9582212023a093148d7a8e146ac52c6e55781b0d5d866394b061f89568046198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10700 bytes
font_02_sfnt_off0000f4b6.bin
4e7b592dbeacd45d14ea9bf4eefd31ccde38aed6a876cc1679cb68060331599a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 21536 bytes

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