Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3803d9d4ae6bfbb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-23 01:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 413651f17e970c33d42d65b309fa7f92 SHA-1: afad4e5e486b95e73b18d3f9b24dd88f790baea7 SHA-256: e3803d9d4ae6bfbbecde154fe48bcc4e9223ac5ce2bcaa8a97af63ec99ab2e6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bawaniint.com/ckfinder/userfiles/files/livoro.pdf In PDF document text
    • http://cpghollywood.com/userfiles/files/kipinevidajeparemivefe.pdfIn PDF document text
    • https://webmenuplus.com/images/file/gutelunavejesivevuza.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/lesaxuvupapizovubobovur.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/62566677619.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/18887966898.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12526556649.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/texuw.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/656970650.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/wizepu.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/32659021075.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/35418108910.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/numexebu.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/24646551481.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/62907849596.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/tezalakomibetasogimufo.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/roxerifosop.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/lesufepexinet.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/guboramovukemurozokaze.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219131228174429.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/bazunepadinifejemuxa.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/13479938659.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/riman.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f18a038e---pewedafikuzuwiguzogeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ludo+arena+royal+king+mod+apkPDF 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_off0000ba87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA87 16020 bytes
SHA-256: e0213d0594d40884317fd40c09922b68e974f3c3704864fda3b4c61683e5a029
font_01_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10732 bytes
SHA-256: 300453eeadde3a5ce57dea325a65fef25136409a373e8c4b0594a352a358b39e

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