Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c37844926569ae7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 21:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 497d636a93517872d49dc54306bcac65 SHA-1: fe1fe97884fd3dbae7249b25ea8076915ecacb20 SHA-256: 7c37844926569ae7b564baab0d1dd59c41e2d9d1ec620581139b0fc3541361b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://handinhand-daycare.com/ckfinder/userfiles/files/62308847009.pdf In PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/23808230520.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/putawedopukatesogazis.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/90081496262.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/72756382288.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/98452908566.pdfIn PDF document text
    • https://85097781.com/upload/files/2603565157.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/suzakavosawobene.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/rasuxasuxadax.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/91753637181.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/42767205510.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/xejubegofez.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/49664248418.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/tizivogivemepowaloj.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_44BCC802ABFC97F5.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109110101502607.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4054224f3---23508551357.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/22682218464.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/29731610140.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/95319739835.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/7899648152.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/15381101325.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/78250204092.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/1705610956.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/28484464130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=schedule+recurring+text+messages+androidPDF 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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 17760 bytes
SHA-256: 3d4ea3a57669c941dd6ac448492f25b98de8fd164f45d6ec2c589de40fe21a2d
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 11092 bytes
SHA-256: 476fef681aea4211512fa4619c48d439ab8f539efdbfd36bb2717bb38b7a4dd1
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1