Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa74a3bc1f0b9ca…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43c5bd0db12bde3e78142e534898abd6 SHA-1: b86f85183abab7e8999e6b67cd9a185b0c5dd712 SHA-256: aaa74a3bc1f0b9cacce65ccd10cd147cc7d82f9919baa8260fdf0f6bb5be4c40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it could be used to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gnox.vn/upload/files/jimadedifez.pdf In PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/kafolavademoxijefabonasof.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3716837c7---31033338801.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210901/1147515743.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/60997091147.pdfIn PDF document text
    • http://kite-surf.sk/files/mebib.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/woruwadelovurilubu.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/runemazutavodagowalo.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/30050414578.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/19177632216.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/80134529623.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/82622388675.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/miberoravo.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/gulakibaxejoxume.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/dewolijetezumaw.pdfIn PDF document text
    • http://www.depomatrial.com/file/20581598491.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/52447716158.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/4255192080.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/bidalafivuf.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/xawipi.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/46197895827.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161329a6256425---6800642509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ad+blocker+for+laptopPDF 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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 17404 bytes
SHA-256: b5b71bedb010e60ff46bcbf05f9e019f9c52c59b23228c969c930c6fa39f4f73
font_01_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 10460 bytes
SHA-256: 29ab44db3c8b7e7036b214e3ead20a49124c86cc36600dc42f1552b65e3b090f

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