Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cef2e097f9132a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 00:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 819408442f2226c68bc660656a1d35cb SHA-1: 6d6004cc48f9a26a50a502eecb1a9d0ef35cfb3e SHA-256: f3cef2e097f9132a734df9dd6d0496c06fb5b3938125b16a0a57bbdc79534b7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest it is used to redirect users to potentially harmful websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mirai-kankyo.com/userfiles/files/senorupag.pdf In PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/jorolatabepamopetivukarod.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/98541392966.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/fojujogedelinul.pdfIn PDF document text
    • http://retailcop.ca/files/vedifiwu.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/68596815551.pdfIn PDF document text
    • http://apicn.net/upload/files/gutugenugel.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/35003329841.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/659732075.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/93479089207.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nokigexuma.pdfIn PDF document text
    • http://onlinevay.com/upload/files/41781149847.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/8424748064.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/sokelafudoburofeve.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ximunofefagupumise.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gebateluzi.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/1525733392.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/simeparelunizasa.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/rovafodasejoxawa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ebc7b2f182e0a35d84106f11fc7aa35/retutiduroxobolife.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/62176162795.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/bavixovinuxigup.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/ziliwareduz.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jetupesepixidekerujitif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solution+manual+physics+for+scientists+and+engineersPDF 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_off0000c3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 11356 bytes
SHA-256: d3d0c1a4d17ba80982a5a1465202107822691f64279b996109354b5186fc84be
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 17820 bytes
SHA-256: 0f8174199875142748c851ec4c7511d80c1163b3964462e83d07d424c2a28214

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