Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd806f25bac648d6…

MALICIOUS

PDF

93.0 KB Created: 2021-09-09 15:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b03b42206a2ff23418cbb2817801bed SHA-1: e88cbecaee9914ff5ff4709412a6422d8b1e9b14 SHA-256: bd806f25bac648d6085447a4254711913ea1441b135e0ae5e58f30c52e81d71a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The PDF structure and embedded links indicate a likely spearphishing attachment used to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://dortmundpools.com/contents/files/giseporepilonipuwowi.pdf In PDF document text
    • https://foodexgida.com/uploads/files/74860298955.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/kuzetizezoxeb.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/1491694471.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309673ba655---85664867734.pdfIn PDF document text
    • http://lactopad.com/uploads/files/25801464373.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/79666561381.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/vaweboj.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/8049015460.pdfIn PDF document text
    • http://htwy.com/upload/file/vujapinebobifube.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/32845781042.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/kadezalubozajabi.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/62562310289.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/87440455194.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/fipezola.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/lifalofi.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/xenasigisadapepivusage.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/kibivunamim.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/34681617099.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/82159386997.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/75472772993.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5bbc7869---dakiboloxotafikebat.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///dunibavulepefufitas.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/23636568665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mensuro+by+uncle+ato+lyricsPDF 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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 21260 bytes
SHA-256: 95d2c7d0ebe0eb3948bafa0ad8bcf685247fe51e112d0bfea48777aac3107099
font_01_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCD 10572 bytes
SHA-256: 92c4c8f5a4b353854d66304fc4946a910b28fe86852a3f84f81df1d6e32de295