Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34d31f7dc16aa59…

MALICIOUS

PDF

89.4 KB Created: 2021-09-22 20:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdb1e0c835ea6e502ab397528cb3e2c7 SHA-1: bf511be4172b3ea638bda126d0ae211306ddaf1b SHA-256: a34d31f7dc16aa59c6f441a43072845a40da2741509c3be6b968e4d6ea41bced
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. This script likely facilitates the redirection to external URLs, as suggested by the numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The presence of JavaScript points to T1059.007, and the overall nature of the file suggests it was likely delivered as a phishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://leadershipcareer.kr/fckeditor/_upload/file/64438142917.pdf In PDF document text
    • https://alpinashop.rudy-ra.com/files/9767093119.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rulevulivedabepexofunim.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/32843579615.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/icognqj33c7otksllqj45srv9c/vapobozuxezu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gugodafakarenirimabidabow.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/73722507080.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/fabubezibamarigedajiji.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/73516124743.pdfIn PDF document text
    • http://z500.si/files/wajomozet.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fv72v8abugmkj3kdmegb14bl83/86813240440.pdfIn PDF document text
    • http://candientuvibra.com/images/file/legokuwoxaxabudujeregeb.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/38009403258.pdfIn PDF document text
    • https://rotitelor.com/contents/files/penujudupafitus.pdfIn PDF document text
    • http://namngonviet.com/user-/files/39082244159.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/buporijidasojugugiguroju.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/48185960515.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/tegokalojimomofukogavaw.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/xawukuxudisiravoregowiro.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210921131830.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/lowiluxiwexilal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=a+room+of+one%27s+own+text+pdfPDF 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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 10564 bytes
SHA-256: 5cd555bcae33716f57049485612f900aeba18f41a4773dd015ff3763a8686f9b
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 18788 bytes
SHA-256: c40fe4ef2fda72330b2f894a87ebb338f4f4ad0e3a02e2db13a73b6775c409ed

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