Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51907d0b7873b2a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 01:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26ac9bdf9971c48e85e33e89388c031c SHA-1: c6cf4c00f98d417c756d9d4aed1c7bbd9fe5e47b SHA-256: e51907d0b7873b2a25d2fb9b8ed7d10927e95d85534f8f4f680becf0c86f30b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous extracted URLs suggest a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://medicalproduct.hu/images/files/4729035329.pdf In PDF document text
    • https://chungangroup.com/uploads/files/202109130919122908.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65a9ddfca---tubupanolosigipufuzux.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/65167728699.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/wokuju.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/32671699442.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6999239248.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/29711860552.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/jilebitozakaxirajebagovi.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/lezonarerujanesogik.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/sekodopejepaw.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/xufawetoleso.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/98510561364.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/38849919630.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/50566623428.pdfIn PDF document text
    • https://sanagustin.cl/files/dedowodevesisijavajal.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/53130232056.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/45221807099.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/33169062122.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_CA8DE1AAA5DABDC9.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lurirezes.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/98499c250461ddddc4e882ce99d81794/zufusuwesim.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/dororijubidi.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/36184859871.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/63222258941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+emulator+for+pc+lightweightPDF 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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16784 bytes
SHA-256: 95c0e7f03686723fd70ec44d1901e020095df92d2cb6597f9934834b0af2b064
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 11068 bytes
SHA-256: 1a3ab6a3e8b5f85b8821b5787e3487d430eed75825ef0f87c44e0d02547d81db