Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90b6640376ee70c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 03:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46a65fd963c2072fe5d6f2d55d05b8b6 SHA-1: 0ad44676d98d5619d208bb4c872e69d4f40c19a1 SHA-256: b90b6640376ee70c8fcc49c3d6f9e07d6da3fedf3ec2496f446e9d98ef7ed879
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://partnercable.hu/files/zububix.pdf In PDF document text
    • http://elisa5888.com/shopadmin/upload/files/todunadijeboleta.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/1206210057.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/napisodogizenakufolep.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/82820132356.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/6790850458.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/75752023584.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/14485473311.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/goxivulelorodafoz.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/bopepufusabufezoxelonakez.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/56790596045.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/rukagijanopudap.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/lavefofimepev.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aebe0de24---tirodisosiwuguwatuxud.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613627aa93dd4---42362878926.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/84824799606.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jikisumiko.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/bikubopisar.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161341d428caab---94516581228.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210902055835.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/lizorenesunuve.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/43871538363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=half+semicircle+formulaPDF 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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 10388 bytes
SHA-256: 9c9c384f1eedb2c38418d5672dca149dae4fedc709e4a8ce5242492632edbd8f
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 17836 bytes
SHA-256: 20cb14e8bb43f7b349654644502e0c8c9f6ab77dc81eb52c0d3e7404ed7b2c97
font_02_sfnt_off000128be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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