Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3bc7c43908e1a7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 02:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2293c14a8bcfa0771370cbd7ae72881a SHA-1: 6769aea4dfd31abd7571c21855a03a8f2406dc1f SHA-256: fc3bc7c43908e1a73eb9082861b441aedc1a32155b872b6ec7d246eccf3431d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://akvanova.ru/sites/default/files/25366774971.pdf In PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/vedetulamopugalag.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/68047113985.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/nofizinugukugizogabuv.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/32952021537.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/15538630833.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/17456763593.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/towig.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/15027349900.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347fb521bad---juvifagiruduz.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/2910516674.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/wevorekamovugubulukab.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/17644949352.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/72965137858.pdfIn PDF document text
    • http://cocoal.com/uploads/file/890426663.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/30210548156.pdfIn PDF document text
    • http://charivne.info/images/file/lubokamuvibobo.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/fobegakovefagiri.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/88501254167.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/76859074090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pubg+free+download+for+iosPDF 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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 18384 bytes
SHA-256: f7c5744d2ddcfbc54cb88803009b80170e513aecb291be4482e3ceecd6c0da4e
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 10756 bytes
SHA-256: 6f8ebf3b6ef84ae6949767dad35fffb2660265fa402163af6c85a72a3ae6d96a

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