Malicious PDF — malware analysis report

Static analysis result for SHA-256 37537e4a1369ce9f…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 19:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50ac50cd8eccda947bf8d1603a693c4f SHA-1: 5ddd649fea8e95dc47887a17e2bd5b60925e7a4f SHA-256: 37537e4a1369ce9ff6d603de1ae09866b0d87649dc8e365ba61826907ae9bbfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs, many pointing to potentially disposable domains, suggest an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly imply a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aokman-drive.com/d/files/fujarubizopilun.pdf In PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/3392926791.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/jegazeraputemabixixudow.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/39646168266.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/80580626568.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/zojatujufi.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/gisuf.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/99754709697.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/muxekexezakumunekumav.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/18435876871.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6b98fdddd32a845ff347880ddfb47f23/zupubufiw.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cg6f0vv58d5dlpo6965nr66afn/26485998392.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/97835321831.pdfIn PDF document text
    • https://bloc-immo.com/images/wemapan.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/85321703647.pdfIn PDF document text
    • https://rajaunited.com/contents/files/gokijoxejiril.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/mexaxadofominutezidapab.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/7739765669.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/65861070570.pdfIn PDF document text
    • http://attlas.center/userfiles/file/24187784178.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/26387664994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+9a+camera+sensorPDF 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_off0000ab27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB27 10600 bytes
SHA-256: 6ee011bba4571b50e33e5c8aa92c41ffe053538d04fa0af9b3ce0ae8fba128d6
font_01_sfnt_off0000c357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 15096 bytes
SHA-256: 595af575047fb13bb15009ae68c78c140e080c2b39b94f26080098890ddbf7e5
font_02_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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