Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d14daa85f905d80…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 16:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6488087d96bdbcbeccd79bde8914bcc6 SHA-1: 98bee6b25de0aed5561e715655d7390144868754 SHA-256: 0d14daa85f905d80999790f863edacf2251235d3583b2dfec814755ce5f68e8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of disposable hosting and UTM parameters, common in phishing campaigns. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests it is designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lishasurgical.in/ckeditor/ckfinder/userfiles/files/wifukumusijalotosaduzolul.pdf In PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/taburukujafam.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/banasegipiz.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/guluwapomobuluwim.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/63266002123.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/41269013061.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/zitad.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/fomupinun.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/jarivefaramebojikikefazis.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/jesefapoz.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/tixutagurapebuno.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/magakoko.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/84577464868.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/bivesifibigezapuzelulova.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/36560941902.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/73145276029.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/deloxizezejudirexoxumiso.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/93843820805.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/jokonixiwodiwotewefufeki.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/70716673398.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/82975206360.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210917161902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=open+android+app+from+url+with+parametersPDF 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_off0000af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF87 15248 bytes
SHA-256: db5ed8ae2885a371ea4119360c3c6b35fceb458ddd45fb704f51f0e7fe638283
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 10972 bytes
SHA-256: 0dfbe250d97cd46305aaa54729459b4aee8aec56862c21a20a090129c28a7645
font_02_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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