Malicious PDF — malware analysis report

Static analysis result for SHA-256 db436eeca2478ea6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 04:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db3d45ae752e4c42341621aaa4513477 SHA-1: bb7df2187c8b51175c78aab0fc1ce56bebfea353 SHA-256: db436eeca2478ea6984cacd2f5f239e734ad116141d0d6195e26dca7098eacd4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the pattern of using multiple low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://daisytalavera.com/userfiles/files/9393941329.pdf In PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92e50def2---47020017163.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/gememojegidigowa.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/3914935059.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210904201024.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/kiserezawitewa.pdfIn PDF document text
    • https://onlinendttraining.com/files/11318254343.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gezamudap.pdfIn PDF document text
    • http://klaaswester.nl/img/file/vawusurudasupavovet.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bewupuve.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/86510461811.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631046075_69fa902d7c.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/21874939407.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/koxoda.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e919d08036---guwutew.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/52756262026.pdfIn PDF document text
    • http://ruihuitax.com/files/file/lefovipewob.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/52867647134.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/73406988547.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/bujituwik.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/waditeru.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jemajuresozomisap.pdfIn PDF document text
    • http://suaups.net/userfiles/file/47983586736.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/revobevusopubodut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=auto+start+app+android+tvPDF 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_off0000c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 16768 bytes
SHA-256: e2f306704cfee87895a4dd08a63eb446c6ed4b0f5c292987af3cf40b07c43e7a
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 10356 bytes
SHA-256: a7179af80e92f75eb55c383f875125649f349c6c626fa6503cefaf983690341f

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