Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce2c8690f891740…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 22:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14015b3b8a854c082278e213216eb537 SHA-1: f8c9eb1c187a828e7ce5528a6d7aa32c75d72165 SHA-256: bce2c8690f8917403aa5c992962239eb96c879281a3255712e048ae4db0ca325
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm designed to phish or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://khiensa.com/UserFiles/File/nabexemovejumoka.pdf In PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/74218744023.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/84847744939.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/jomekotuwenuxuwalum.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/80237164962.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/wetisaposogiri.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a23ebc4e---muzerifi.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/51262669959.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/fefilomiduwigutaburomu.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/32912282965.pdfIn PDF document text
    • https://sapporopools.com/contents/files/zebotijapusivepitavawipi.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/nusug.pdfIn PDF document text
    • http://klaaswester.nl/img/file/kimemivabonineguvutamuru.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/33881254600.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/21844845840.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/nuwefigu.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/65906529700.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/nemezuzoxutugurudukuw.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/mamifudijuzokoga.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/53372807583.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/goxotaredig.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/7694874474.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/pexoposim.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/lagedutigojuxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+freed+fullPDF 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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 10416 bytes
SHA-256: b72d2de7a14c8d02d8e85d05a7d8a329555b3959f2b2e952adacef54a5faa701
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16856 bytes
SHA-256: 571761e62d4de0bbf36b496f1f59a154c69e47b4bafe68997ea564d83f189d85

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