Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeb5d9d020ccfc1…

MALICIOUS

PDF

106.9 KB Created: 2021-09-21 18:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ffc13d10700e80af8745628bf785c38 SHA-1: b8b114df4906c6461d6e356453ae7b547ad71352 SHA-256: dfeb5d9d020ccfc127ac0b45efb138396da3642c5c44b9b5dbc4d9a2c6740c08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=pokemon+drastic+emulator+download PDF link annotation
    • http://konemara.hu/userfiles/file/81856159091.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/89575048166.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/wofinara.pdfIn PDF document text
    • https://unosms.us/userfiles/file/difes.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/48764064609.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/xaridem.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/zaxuvisovapasudomugeje.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f770ee021---24657528393.pdfIn PDF document text
    • https://basisangka.com/contents/files/36651637107.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/lovaxovavarixe.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/14941527970.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/zovimavisekexonoravob.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/77319894523.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/xekeliladabureso.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/zasawapozawexedeluvudivu.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/3859008217.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/tajebijepedi.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/35923896391.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/lunusewujudulavadalufogo.pdfIn PDF document text
    • https://nevisnews.com/userfiles/65930005252.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/julezukaze.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/66451944198.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/49148070897.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 27268 bytes
SHA-256: 23b1d3b0e01ea124d0f7084025338fdb9f412bced0893f456e6f52a25405178f
font_01_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001614d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614D 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_03_sfnt_off00016a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A46 10812 bytes
SHA-256: 420d4e25a0554403629e929e2e5aad69e61786356c2f73084893480ed924e6e4
font_04_sfnt_off00018347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18347 17100 bytes
SHA-256: 57f6b28c7ecc9de0010341d38aa6c3367acfa623709860bdfa6ecb4c5b9e9fa6