Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6357090f55800f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 09:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7954153820f224de4d20759337c74ee0 SHA-1: 0523a3d9d9c82347a7f29b68a77096cf49156151 SHA-256: ac6357090f55800f8143012c58d77ed98ffaa62579f7435fb539783702f3eeee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and embedded URLs point towards a phishing or malicious content delivery vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maxflowfans.com/userfiles/file/84845018300.pdf In PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/8852959978.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/japelopesegumodunetu.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/56185483114.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/devuzibugokixodixesowibo.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/guvalerilikitaluv.pdfIn PDF document text
    • http://greenglobepms.com/uploads/42028933938.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/67398580658.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310ea96f7d1---bikaranibum.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/26668916418.pdfIn PDF document text
    • http://premo.at/userfiles/file/247184824.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/limasekix.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/36436065968.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/25134101886.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cf427b947afec7a0c7b1f62733e81dc1/tezebatabu.pdfIn PDF document text
    • https://mihalex.by/files/files/73806777493.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_144709.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/233104751.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/98530519606.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/vexanuvabedajunaveladu.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/vegazafazobozo.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xuzuvalabimunatefuvisudin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=instagram+auto+followers+increasePDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210906/16308823978794.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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 18172 bytes
SHA-256: 3679768c6034468be7306f99bfb3cabad849e21957d5c64d0b2cffa711f36e55
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 10816 bytes
SHA-256: be2f1e0e0e71dbc872454a2b8bbe4ff2ddd96797efd09b8c0cb8f356aabc2603
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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