Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ce9061b658e14d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 07:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b99c5b746e865b731440a6fc1983318 SHA-1: 66be7d02403f9da75f17cee3e9489d8834597d09 SHA-256: f5ce9061b658e14d5007bd5a2f98d1edc3af396bd765d19f9c873ee24ed6494a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute content via disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.mariabeckmann.com/fotos/uploads/files/53874324964.pdf In PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/fegulabilowunakarorubut.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/bekum.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/41017185280.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210909065808.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/dadolirerelevazosawu.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/luboruzu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/31a0e1a765d39b03a8b1b907f0267e36/5391761963.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/44040509093.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/23863552319.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/12632622566.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210905_FC2DDAAE1AA2A736.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/labanefu.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/pubevaf.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905104814346019.pdfIn PDF document text
    • http://castel.lu/userfiles/files/71789800175.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb66b136e4---kolamifew.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/jozefosa.pdfIn PDF document text
    • http://asfalon.com/__files/file/bifafefofikagoxu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/85924080637.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/najonurusapuvenumikokos.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/98000961831.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/57101795186.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/bunebezejipevavilor.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/pujuridamupowufose.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/78940906180.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/16926967076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=queen+and+slim+putlockerPDF 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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 19248 bytes
SHA-256: 2c188136c007bd145e797e59aa78dc6d0d6d7a39a29c75af9d7a5dff3237a3a9
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 10928 bytes
SHA-256: b18f58bcd1c70c234e85227c6046038e468aaaf6a1635c6f459256131dcbe569