Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16582fe892addb1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 05:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d6cceb00bb0e4c59585f9f63748e8f1 SHA-1: 2b17b33f5638525cf51b63bf200996494987577d SHA-256: e16582fe892addb1a7fdb6ecbe139d5a2ea19f985097088243f20f17126765d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The presence of external URIs and the structure of the PDF suggest it is used to drive traffic to potentially malicious websites, likely for phishing or malware distribution.

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 https://smidgel.ru/uplcv?utm_term=recovery+application+for+android PDF link annotation
    • http://veganogle.es/uploads/ckfinder/files/28200560121.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/webelutufagewox.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/wofijugufirotumitiwa.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/21651565299.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/88337511625.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134765c4ddb9---mazukuwisetuwojefi.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/fezomapupirobebitujumop.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/72305092751.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/28607393778.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/zadosopeniwovotapajubexo.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/86320453262.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/lazupopenufoguforubi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331a594e0d0---zejarewonijizurujap.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/kufedexoregupeja.pdfIn PDF document text
    • https://laps.pl/userfiles/file/bonurigadejogimelenaferul.pdfIn PDF document text
    • http://sjhtractor.com/d/files/nepilajasirenasegowa.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/18781700636.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/kidovarejebezotebepi.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/37994149198.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vubomajaxizelef.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/39219598771.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/20532113101.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_off0000b72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72C 10668 bytes
SHA-256: 7ee6924ac634869c6c152a7cbdbc93373ac45729248dedf7e264386a4a32e8b0
font_01_sfnt_off0000cfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16620 bytes
SHA-256: 3e3ec4e3c5a489f423e1a54bb38f15660d9a67119f1b1c550b1cd7af988bd5db

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