Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f4df20bdd63c6d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 06:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46a1e7f67f0d3d102d3737ba0b42e6ba SHA-1: ae6a0df3fa6eb86695a4f2ac5693f39ad15e6f74 SHA-256: a1f4df20bdd63c6db8dc562a385f2d6b498cd17f4ff420b6e9f9ca217e024fdf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that redirects to external URLs, indicating an attempt to deliver a malicious payload or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary lure appears to be a fake download link for a game, directing users to a link farm hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=download+crash+bandicoot+4+it%27s+about+time+pc PDF link annotation
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fesexivajel.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/letadefonopes.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/xejobuxupodemo.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/22604438332.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/daluzunojifowodexomufezok.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/todekusuvu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b0e9fecd7755712c7bb9128ad878b7c5/bodezedebilavisebexufoji.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/gutakesopiligu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/25824539158.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/54418171276.pdfIn PDF document text
    • http://climtech.com/files/files/letemebagemid.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/81425966505.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/33785273714.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161337c06e0a5c---xoguluzobajufovanuke.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87679823567.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/91317007452.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/73361273948.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/76082875377.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/xalefurebitamepatij.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/58960176405.pdfIn PDF document text
    • http://wajl.net/img/file/202198225448.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/9894594037.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xakevomado.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/56836037840.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/xigowikok.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_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 11220 bytes
SHA-256: 425534602f8d25c03f8c9acd4754fba499c41e47b3cc6746aa38cb103b7c4b64
font_02_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 18488 bytes
SHA-256: 465f18bec0ba259527029edac119cc06e463e68e6ca47be329a68f6e4dfd365b