Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35ee9f528601610…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 16:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7896012045752255f125868ff5e736f1 SHA-1: 358ea93696d54c75f4b1ad1691133d565c72de8e SHA-256: e35ee9f528601610a5b61d327c923c7c5b18a8cf2145af065a9eb75a350704ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a high ML score of 0.997. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, hosting numerous links to other PDF files on disposable domains, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://bodegoncriollo.com/userfiles/file/83271115053.pdf In PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/1102156356.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/41574601842.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/90258694133.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16147a2fd137e1---38468249683.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/liwotawomogakobaj.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/23386945659.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/42100411934.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/22707647360.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/4203656137.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/menemuvobopovukedadel.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/vafuxalewusuni.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/7194021564.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/latumoboninoxenedixuvoxuj.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/bomiban.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/47985943650.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/wapapon.pdfIn PDF document text
    • https://panama4d.com/contents/files/ninasogidafuliduzovowunir.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8849e90af71d920176852939b3cced49/47557772506.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/motodorogabupuvuteser.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090111140728.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/60286370489.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/35044917681.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/37120306146.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202199_64843_693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hot+female+korean+actorsPDF 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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10488 bytes
SHA-256: da4e593fbf8713478ce5b61276f97686fcea9b3f9b6c0fe7b579211304fd2cfe
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 19036 bytes
SHA-256: c9022c4b705992cd2f8073b80064ae1bd080d7be87306eac1e6a777d8573bf0e
font_02_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1