Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe42ef564d46ca91…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 15:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6938ce6fb5058658cc9e5b6f2158ea60 SHA-1: f94b689c053907347f0ed54fba8da8cc9cebf625 SHA-256: fe42ef564d46ca914e459c2670459d9fe498812535d05b35229a19f4fe26f108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=android+phone+in+5000+tk PDF link annotation
    • https://adminico.nl/userfiles/file/85025147484.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/kapakiko.pdfIn PDF document text
    • http://c-amc.com/upload/files/bakopofumu.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/nonuzedadanodexikonelurin.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/xutojaxavogegisapuxaze.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/23839349788.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163175100073.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/57478146111.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/vewezefukewegesarewinuzar.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4f88372b35eb7690fb98273ce5cfcecb/39813883879.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/turuvirekolakit.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/86802044227.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/rusemokusaxew.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/wuzune.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/zigos.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/mumupuxikupo.pdfIn PDF document text
    • http://ocung.net/img/files/naxajimukabefezefivad.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/si7gg571obh8ru5oeg6suofdl5/85263670531.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/waxedazasubigexurotijek.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/71101729418.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/kotoluvorim.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/76254757600.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/30113331920.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/batoxigizus.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/mizofibiguruz.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 16272 bytes
SHA-256: 9214f26839cb5734965126fa8f28456d39453773723f69ca245a4789fc62f5c7
font_01_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 10440 bytes
SHA-256: 7a906790a0e9007a5287592a3b29c7b4f7a4f8799068e371700fd9e601830e25
font_02_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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