Malicious PDF — malware analysis report

Static analysis result for SHA-256 2998283c9e2e6098…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 17:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 002daaee7e3cc710e9877c37c8477a14 SHA-1: 4ba793b8813bc8bc43d3fdeb2e07a1bdc825e03e SHA-256: 2998283c9e2e6098a471ae2425e8638e24e156784316226d6c6816f5592b35fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, indicating a potential phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://yuc-fac.com/uploadfiles/20210921015432.pdf In PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/44277656393.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/tuneguse.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/rozix.pdfIn PDF document text
    • http://tano-cable.com/d/files/nubawopejodek.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/fimibuwitezakumovoludinig.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/1110074126.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/56851965715.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/60895674278.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/jaxefakeselezavafemabut.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158824584424---komim.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/33374443297.pdfIn PDF document text
    • http://ipceurope.be/assets/file/xesuvowekogo.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/83930250565.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/39962549911.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378ae66818e---rinudufixarav.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/kogobulilek.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/43952888974.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/53571278447.pdfIn PDF document text
    • http://travellerisland.com/files/nelulemesudawunix.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210917_AA6DF6885C6CEFE7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+grudge+websitePDF 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_off0000af8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 18100 bytes
SHA-256: cd31594bd397bb00b73989ff1e4220d395195550724ecb3f403e1e0debaa4eca
font_01_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 10384 bytes
SHA-256: 0ac9cc7f262b421108d7360d9f49928d5cf647504a39db703334d85a1f50c672
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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