Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d4c61f30a92cbb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 08:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76e6a9d5a8188659837cbfe1dfdbc337 SHA-1: d331b42ba814595faa90d7a99385661cb4c82c73 SHA-256: 55d4c61f30a92cbbd53aace875c91621cf7d5ce98be8c73336d7d421c79a8bb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely leading to malicious sites. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=application+android+pour+recuperer+sms+supprimer', are strong indicators of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cructi.ru/uplcv?utm_term=application+android+pour+recuperer+sms+supprimer PDF link annotation
    • http://dtyxbpzx.com/filespath/files/20210908062912.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/52199100727.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/95209219241.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/fivobivofex.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/pezeperolani.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/2137609333.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/minubobezuxiwijexemotutub.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/kurobeku.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/barotabusize.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/46200328604.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/fabaperutosuweropifofem.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/35949836203.pdfIn PDF document text
    • http://videlec.be/ressource/file/51030259209.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/33563774175.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wiwirumowipeninovi.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/39230329685.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/9132412105.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/39956195693.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/21926366843.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f116ccb63c---wibedotigusetuwepolebaj.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306145349091.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_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 17944 bytes
SHA-256: ffb8c75045d0d0d2bf1fc1b8fb305d5dc2e28196c44063298fbf82847dca257a
font_02_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 10756 bytes
SHA-256: dc5c1062301af15af243202255a5912a4bd07c32f78723cd5dedf16093c5a4fd

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