Malicious PDF — malware analysis report

Static analysis result for SHA-256 52950e900f6e9fd1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 09:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 58b58aef4eb3b62d49c2c5a314c7141f SHA-1: b485d8e1fae6975d269eaf478f553c450fe904bc SHA-256: 52950e900f6e9fd16a1401c903a5d3d764d8db2945a971a4d309fffcce1d7f0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing attempt. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect the user to a credential harvesting page. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://thietbiotovn.com/Images_upload/files/98635602949.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oucukm2rev751idg3b7db0p580/38267937812.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/3045557175.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/sodojepowajejegimitupu.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/fuxenivewuz.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210911212148647159a1fkse.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/pibijiri.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/64572001857.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/69751157628.pdfIn PDF document text
    • http://szhlfz.net/upload/25976790643.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2cf8e2e99e4baa1c5220b8c5adbc58e1/98859627998.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tojeko.pdfIn PDF document text
    • http://linza-market.ru/upload/files/77224646136.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/93954092844.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/zamuzuxewuwafirijagixom.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/77069349054.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/12417578379.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/kaxogajidofiririlelita.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/22318198120.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/kexaxojenoforesalam.pdfIn PDF document text
    • http://yjccnc.com/upload/files/11898706094.pdfIn PDF document text
    • https://ksuskalology.com/images/file/dosigesi.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/86496333971.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/81685652013.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/jivalilitun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=account+live+sign+inPDF 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_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 17356 bytes
SHA-256: e614584f1dfb92d15a5eff094c02e3fe2b266480745dfacfef5ef0e50e303262
font_01_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 10292 bytes
SHA-256: e868de5183532f574952d71e78a7b492908beee9939a6296bd1ff52a08339463

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