Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1aa0423cb06b4f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-10 22:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eeccaded620323394734eba3191e5a4f SHA-1: 9f8f8be509228b3fbad5f6991e2abd4d1b00a102 SHA-256: 5d1aa0423cb06b4f1a73758c256367b8bab6606f2297def7327436fcd645d667
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. No scripts were extracted, but the primary attack vector appears to be the distribution of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=how+to+play+3ds+on+android PDF link annotation
    • http://seatraderhk.com/userfiles/91729716668.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/rapexupebukebadagupa.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/vetoxunexowej.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422d0afb6d---61992201764.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/bavuwufovegadasol.pdfIn PDF document text
    • http://wernitznigg.at/files/64627521678.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ctu2cjmk5mn9uotdif37g6g1u2/sewudunasovalaxif.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/55454534740.pdfIn PDF document text
    • https://ebooksweb.net/files/file/65105707589.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/tifabuxisunuxo.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/68058041818.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/74336647702.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/41445382534.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/69322137217.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/muborewapuxijoxibejad.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/66890599051.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/98308783904.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/8271358422.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202198537381538.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jugimom.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/zivizamevagevedez.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/79705932317.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/voxabuzureze.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/43824907035.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_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 17112 bytes
SHA-256: 0e4a758b77e8dfe7434dd3967cbae8c352dd0400f3100d6efe73f0af2146bcd9
font_01_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 10616 bytes
SHA-256: a4a94a8d603eee6b7c6f4a82e0ee130e7dd2a73ebc1ad37545c1ae3b63ad261f