Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e1e50cec7bc2ea…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 22:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91e52efda207f479e435b993d092e635 SHA-1: fff7af251b353b458d3e2b39ce88d9848e84180e SHA-256: 95e1e50cec7bc2eae67b11d6d7fb8987aeadabd7228e3a33248c464faa77dc4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=silk+on+firestick PDF link annotation
    • https://yukkumpulgroup1.com/contents/files/37466894040.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/16729170355.pdfIn PDF document text
    • http://strap.sk/uploads/file/94637149651.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614971b300fd8---gifukopoveselosito.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/97655821253.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/dumimijudupa.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/fagegoxomutezibasu.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/8871006899.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/bivofikinejarot.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/75926913033.pdfIn PDF document text
    • http://specialcats.nl/media/files/xasumozarilazajapajunabux.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/gidozafebak.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/napebipovinedonetinex.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/62439635132.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/13130327765.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/wozisim.pdfIn PDF document text
    • http://wdnederland.nl/file/zomemawexavagorizu.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/lopuwore.pdfIn PDF document text
    • https://netlandschool.cl/files/lilixikimitipugifudoturaw.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/39777716969.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/74194856829.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/bugodariwimuvepaso.pdfIn PDF document text
    • 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_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 10336 bytes
SHA-256: 6de7f4ee04987ddd85218440db470de2df4fb36973a335b99aae4c09521ec7fb
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 19964 bytes
SHA-256: 2dd2cbb17a1f0e3ce0ef5659e35acbe5fcf132cd652c9fe714dd10c6a794eb10
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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