Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f7b908d3422ef9…

MALICIOUS

PDF

107.1 KB Created: 2021-09-17 17:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cc29b618cb501ebdb01e59b726058991 SHA-1: 4c9f45a80756ab6a5196452f7f286ce0156012aa SHA-256: 05f7b908d3422ef94a23bd8942a1a44daf921516619e31b527f4a0a310a899d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which are hosted on unknown domains, suggesting a phishing or credential harvesting attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to distinct, potentially disposable hosts, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 https://ibericadearmerias.com/file/56168109084.pdf In PDF document text
    • https://palet-school.com/files/files/31398649354.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161365444b7f7f---58693894803.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/rutitasepewikuk.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/kejiri.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/lokuwetananuwoxeremizeb.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/lubon.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lipabidamewi.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/44379111735.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pumetunobuwavadit.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kodurajepobujikakefu.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/18027327887.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xabulevuzejopigudejo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/63669104804.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b55202719d141072906e2af66e56947a/figiwijigotelaturerapu.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/21600713625.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/30319882062.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/57653960878.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/rukejozigovagovoz.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/jisujusedizazokekasi.pdfIn PDF document text
    • http://cityfate.com/files/files/75559019800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=words+related+to+curriculumPDF 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://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_off00014073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14073 10520 bytes
SHA-256: 581fe6ee9d965bb91d4a34713f31e55414af7c06bf54d0c55a60fdbfd604788a
font_01_sfnt_off00015874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15874 19460 bytes
SHA-256: a72666efda3355226296bb059d79467b5c4fed3689f79b75c6e05587219e59d0
font_02_sfnt_off00018b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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