Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b901f3f7c5a370…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 02:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a72acc0634c4afc50a7541c08b0ffc4 SHA-1: 67d6461cb7b1cd3d64517b98f3291795cbddaa5e SHA-256: 92b901f3f7c5a370190b7ebbd57b1d1b4073b3fba47f642b2c25b48de38d3f7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=download+cube+acr PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/94403646347.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/26407689344.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/xafumojobuvifamome.pdfIn PDF document text
    • https://znalac.com/userfiles/file/45144399026.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/63492442463.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f6f4cae7---manobelipavubaladi.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/doganojazid.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/kabugulupugorodujuxa.pdfIn PDF document text
    • http://cataga.de/beta/files/file/78119547570.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/nopuzekofaxigitaxo.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/1977137537.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/sasomuwazof.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pokumanalozabifolowawuko.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/jekijiweso.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/lujoganenemujes.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/ludadubasasezotagemim.pdfIn PDF document text
    • https://videoeffect.ir/data/file/66144011214.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f56d1ed9bb---3067817392.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/kexanu.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/suvuluwij.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_off0000aee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 10332 bytes
SHA-256: dca2585379c812752b6fbbf66fda69f5a9481e0a7fe64251027696ba5a7a8c7f
font_02_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 17576 bytes
SHA-256: 895ac468c150b1e674993cb17d6909504fce1de2edb9fe30387996c6f34f6016

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