Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41944f03b6f11dc…

MALICIOUS

PDF

80.7 KB Created: 2021-10-19 20:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 398678933210d0842cce580e75835d03 SHA-1: 17905839f3af4ee8c67f3274ccc383941ec9450d SHA-256: e41944f03b6f11dc5215645f14434cca21745f10b19297e13b59fadc7d5be4d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dostrojar.sk/UserFiles/file/gupematokoxejofikizovatir.pdf In PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/68162902947.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/07c05da6ccb547f59754924dea98fead/gusowe.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/31053259947.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/pemagaparo.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/72249557745.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/48268479765.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/141921367816.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/54997078896.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/76734285408.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616b50a46064d---debefamazojux.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/pudipit.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/jigitukekisubojilu.pdfIn PDF document text
    • https://sentralperdana.com/file/gikuwafafuzoxanuzebogupiz.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/4376131614.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/jedikipifukezejolemututo.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tisimorokubarufetoku.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/pimeturazesuvof.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/71080299317.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/nivunon.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=turkey+burger+recipe+no+eggPDF 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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 18020 bytes
SHA-256: b623e5b237fb7fa1bc3263b60ee091d5abb988a40bd778914f9b63c32f4410b6
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 10484 bytes
SHA-256: 29f400153a6f90b4d33956ecce0fda040497dfc62f08a6412948dd0033b5d46f
font_02_sfnt_off00011dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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