Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0bf4565cd8d060…

MALICIOUS

PDF

102.5 KB Created: 2021-09-19 23:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 68eaf022764d03b778f1051b4dc581f8 SHA-1: 7c3a1cb096c098f4f28b14bb4369a4d846d5d414 SHA-256: de0bf4565cd8d060ce180d3f74cbd03cad25bee94e2108898efe6cbeb79a0bf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs pointing to a link farm, with a heuristic indicating a disposable hosting setup. One of the URLs, http://debsecond.net/UserFiles/File/32731312322.pdf, is a primary indicator of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://debsecond.net/UserFiles/File/32731312322.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/59220182139.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/gotejefetabedufavanesoj.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/72755781282.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/67640075093.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320681bd213---63859919138.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/98280816978.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/32841763097.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/rexezazanokuseg.pdfIn PDF document text
    • https://advik.net/userfiles/file/rovadunisiz.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/44281313434.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/gewixomatis.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/sudukunawomotukebuluzin.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/bosufesagofut.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/92679970786.pdfIn PDF document text
    • http://demkapi.com/resimler/files/44110025556.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d751d621---ruzugovowetubonupaw.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/zekejusemozofinakum.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/kineletobozegusosonanuna.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/mapovutupubirisekagemajov.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/xamal.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/gasebusisi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/limojozulisizakorode.pdfIn PDF document text
    • http://www.pilartangguh.com/file/21237594349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+mid+range+phone+for+gaming+2020PDF 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_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 11192 bytes
SHA-256: 6111c71a5170d98d1cd1dfe3a610e4357d136ab63b83e20a9c395764c1bc5bca
font_01_sfnt_off00014184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 19400 bytes
SHA-256: 48df57a175d7e3c450000b4246eb4f16128353f3067de02e39d54c45af186e66
font_02_sfnt_off0001743a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1743A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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