Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf2778f786212eb…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 15:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ad6117a0114696a90197b2d5621fb70f SHA-1: 8faa4c18cfa74fa7db80869a30f58a3d063ad0e0 SHA-256: 9bf2778f786212eb36a61b21503663778745b259064ce4cad7870d6e4c0feb0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://kasaitogo.com/uploads/files/vofukaxajujuvufurinit.pdf In PDF document text
    • http://bistakalikotenetwork.com/userfiles/file/jotofobobolabapewo.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/makotaxa.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/gaduzeluwiwasuxajug.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/30768074108.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/73268247857.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/wijetawagonavupel.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/10889214702.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/rakukatoki.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff27c53fc---18917839615.pdfIn PDF document text
    • http://eurosolar.cz/res/file/42227958846.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ce8390eb0fc2de8d82832db9d4883b2f/63979992998.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/pufasesorad.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/furanutorobewogemitomas.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/namivik.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/bejevogadiduga.pdfIn PDF document text
    • http://skupka23.ru/upload/m/nuwajuxivevimivuwovufeza.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/luwuwapebelifo.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/gukakibimisedawa.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/49083359751.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/50920996811.pdfIn PDF document text
    • http://i-dron.cz/data/file/91741911424.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/gimanadipamosaxejunowaf.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/68957663903.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/woretil.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/18257071902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=survey+of+the+old+testament+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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 11024 bytes
SHA-256: 314972a01098942ec8b18241e4d95b998635b2702a5f1aaa488668d9d20f4214
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 16004 bytes
SHA-256: 36f028f3e685730264929aa5e7ef327aa723e4566761fffdd6163c6ad979a79f
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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