Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e4ca6136002a9a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 16:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 126d27c108569ff0dd22ff1e5d9d752b SHA-1: b21327c6b499b5493af1f371289bac77220b7d93 SHA-256: a9e4ca6136002a9ad758fe082adc7b3a57b513d8a62774810bbe092ccee17263
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, indicating a phishing or SEO manipulation attempt. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://tbff-bygg.se/img/files/jojefogezuz.pdf In PDF document text
    • https://promise-land.com/upload/file/43182776710.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/fimoboxiwavizozeken.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/41517252466.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/nuxasopafavagososenokag.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/22219198515.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/sepesar.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/padabewosirolom.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kupuwimufedenemefokid.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/20610433417.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/bulexarowimikepe.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/muvesagagu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/7268549577.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/maxasiperux.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/roxosupugorukukexelekumu.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/lovuwolojonitepewel.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136f27612c35---31912160259.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sopodalu.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/15347868106.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/kajifotudowobu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89141671929.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109091010095256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sgs+bhagavad+gita+free+downloadPDF 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_off0000c53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53C 18020 bytes
SHA-256: 5557e64526b7cde8cdfb33096bad66f23c65681830b9fed16e3e0ad15b4445d4
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 11000 bytes
SHA-256: 22eb6edac58acdf6718ae57fd6a44ba6fcb1611b602510a76d01f9528156f4eb
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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