Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9d985b7bde2682…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 22:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2449ff0db07259c875172e53ef2e4720 SHA-1: 426214403981018a78d08b3a880fe4d313d3c240 SHA-256: 6e9d985b7bde2682202b51d3322830591e5a2cfef01a142bd2d0e73ce2b8281a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=how+to+remove+lock+password+phone PDF link annotation
    • http://queenart.kr/userData/board/file/zidilivujebedajuwo.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/rurezakowisaresabuvi.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/xigazisidewuban.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/womonimagafupodede.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/tamuwab.pdfIn PDF document text
    • https://kultmotor.hu/images/files/givatukozuva.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7db9cc438---65601914635.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/8503985524.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/tanalukukawekaleladajogad.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/metovexog.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/dusuwa.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/12376477967.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/60732222538.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/xemorazatasunadiniloti.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/wobozifawamidijoboruberi.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/sawuzujagodoluzemu.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/62634894512.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/46920596561.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/74610439346.pdfIn PDF document text
    • http://wernitznigg.at/files/91862325198.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_off0000b586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB586 16324 bytes
SHA-256: da4d9ef732d3b67976e70b2b408fc36dd246277ec0e161212e117286df59610a
font_01_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 10920 bytes
SHA-256: e1ad554ecc1122faf2aad9997f12d1124fa39d526fba74d4864f2f8db3ea54e6

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