Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca798d6d5159fe03…

MALICIOUS

PDF

87.2 KB Created: 2021-09-19 17:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fddfd2aeaf2ecc7563a0b909a2e896b SHA-1: e1b1ba14efbadc5f18efac42023431d71dce92f0 SHA-256: ca798d6d5159fe03beb186cc1da6de73bf8f1f75923e9598d608b3ef0c5b7e7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this, and the ML classifier output of 0.997374 strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall detection profile point to a malicious PDF designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=samsung+sgh+t999+unlock+code PDF link annotation
    • http://musicpark-live.com/userfiles/file/nijukusexapi.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/kikapozivijezo.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/93439837009.pdfIn PDF document text
    • https://sambelteri.com/contents/files/61659981045.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/zakozovosiw.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/71965132674.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/85040690044.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zoxixulopexagixuderezam.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265161f554---kupifodur.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/wowadowatupa.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/3616335319.pdfIn PDF document text
    • https://braus.uz/images/shared/file/11208173785.pdfIn PDF document text
    • http://gibisch.com/files/files/73637058843.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/vejumevetunofomevezola.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/dunoko.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/39548871307.pdfIn PDF document text
    • https://jotelek.hu/files/file/17576084285.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/98645033110.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/69180794974.pdfIn PDF document text
    • http://wdnederland.nl/file/zomemawexavagorizu.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/tuxejaresitefobarosat.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vifuxemuvisotulisavufoban.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/70779957493.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/34413072981.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/tapajinapefegake.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_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 19684 bytes
SHA-256: d881f4a2033706478e26e198f3eb90c16b16672102ebf0bb108f02005a11882b
font_02_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 11060 bytes
SHA-256: 97c16da753ab83612e15bbb59ed1a46207ed1831d7663e9412e9640c02d4bd38