Malicious PDF — malware analysis report

Static analysis result for SHA-256 e846edece5b606a3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 05:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9afee9defb393e1faffae050d97ed594 SHA-1: 1222ccb7f9f54213533ac758057f1e5c0430eb7d SHA-256: e846edece5b606a3e1db16a347adf0485e4f985ec658b07dd304453da5473929
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kleinschadenexperte.de/userfiles/file/telirotafeli.pdf In PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/56827758201.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/zemokakafo.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/kuzijok.pdfIn PDF document text
    • http://synhbio.com/upload/files/pejimedowupolosubelosoniz.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/gabobuzud.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/21428109575.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161438111730e0---xujibevogomorarosiz.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/gafotadirozirol.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/31855441633.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/21165163206.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210911_8978B9907C9F9346.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/pipos.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/kuvoki.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/kidobilus.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/bevibi.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/4731468129.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/vidawaxawomi.pdfIn PDF document text
    • http://foxadv.net/file/8656651109.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/kulenafubekojulefakon.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161329aad7533c---tafavodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+ball+z+shin+budokai+free+download+for+androidPDF 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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 11016 bytes
SHA-256: 06c4c6af2e52da6e4d3c34b997938d194f605f2d83a5bc47628d3a21d7e99355
font_01_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 17020 bytes
SHA-256: 45ff697ccf7a565142e0d647f2813f54eeae16f585063d1cfc8948480be8b44d
font_02_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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