Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdafc15dd78c503…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 14:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e58f137c20021143a9392d1df8b4a32a SHA-1: cb7dfa2dd3dec482928370b76be77da501a7ee60 SHA-256: dbdafc15dd78c503d140901f06439328d000d06c460df439eaa292ce5340f4cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate external URI redirection and a link farm on disposable hosting, suggesting the primary goal is to lure users to malicious websites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=guy+pearce+prometheus PDF link annotation
    • http://dhf-china.com/d/files/69993487642.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/35817038491.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/laxileputepomo.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/zilopuzazamamadogek.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/dalemezalakofaxu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/34898457373.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/sidigirozipubop.pdfIn PDF document text
    • http://yoron.net/up/files/55018403098.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vafatuwudetabur.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jenuxiloradelimuzojaniko.pdfIn PDF document text
    • https://izometal.net/mm/file/fedijofuzegujawaduli.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/burumowilirironixi.pdfIn PDF document text
    • https://quizai.com/uploads/files/24141841672.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a74e80bd---nipigevunetebawekusa.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/55995677369.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/85065966525.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/81633027938.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/68055131524.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/89143461932.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/duxunuxo.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/koleder.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 17508 bytes
SHA-256: bc72e7a43b1031e6f145889605647b2de1b55bf6a2e0eae3c06b6b0d39694e10
font_01_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 10648 bytes
SHA-256: 5c76a995dfbf66fa268d915ee3c05562e4ac311fe7c9647f73e3aad33e7edab9
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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