Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d76221037b5d87…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 10:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65d7942cd086322ee75be9e3bf052d70 SHA-1: d7a0611d0718ea69793de9d380206c1824121a09 SHA-256: d5d76221037b5d8794f84b135f15cfd2df45c9334f0c0e00928f9544ec13ec00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chetanaus.org/bheru/uploadfiles/file/fanemadarawukesoz.pdf In PDF document text
    • http://movitecnic.com/ressource/site-image/files/89332728334.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/72774318501.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/28947437409.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/87554934090.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bifulosofumoxagasilov.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3438306a1---pusakuwidagodig.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/mexobefiluxaduwawalitikus.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/sixowuzopelulanoruruxakin.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/96984436660.pdfIn PDF document text
    • http://portableandcool.com/files/files/9130304180.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/ziwovabugogi.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/womuzaperizutireje.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/45491509525.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109200955401484.pdfIn PDF document text
    • http://dalaichau.com/files/82892650604.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/zonexoxet.pdfIn PDF document text
    • http://vettercycles.ch/userfiles/files/vinigotefi.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/86899875912.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109091014534786.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/80655475275.pdfIn PDF document text
    • http://anindecor.pl/files/file/vakarofun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=drier+in+ac+systemPDF link annotation
    • https://lapdonline.org/file/puwizabugawodiwunapego.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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 16508 bytes
SHA-256: 11b0087587a051c340319d997193cbcb31daa7c35572b7ebe5979d56acddc499
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10340 bytes
SHA-256: 29a7901442aaa714443f17feb7b2766c6969828b1494c9369f1319af99a62795
font_02_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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