Malicious PDF — malware analysis report

Static analysis result for SHA-256 672db28e69bb640e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 22:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: faa246f0808e7899754c6ef35b5042cd SHA-1: 2e10c625d1b52a6f59d06ec4835cee307c81b83c SHA-256: 672db28e69bb640ebd41cc9de1a594dcb69866e4e3ea18d9917c34afb4d54750
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fptica.ru/images/file/wobivimirisonijakigobesit.pdf In PDF document text
    • http://ytlcases.com/userfiles/file/lasem.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/66183966691.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/81514244714.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/15601988963.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/16778112652.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb0398e3f---xoziwazekitugote.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/78977246401.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gejimu.pdfIn PDF document text
    • http://wjcopy.com/upload/files/4058189389.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/gerako.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/dotatilujapaxime.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/80819753338.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/75912340193.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132beb73fe4a---jagudalexutidusabibov.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/48944859221.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/48806271714.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/xerizinuk.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/vaziju.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/20741917220.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/kixezi.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/44747329054.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/busibumo.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/20769238001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+backup+contacts+and+messages+from+android+to+pcPDF 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_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 11324 bytes
SHA-256: 142108a7b11c31aa144b248657a004b3ae7b70f720b752909836cbba319c7b90
font_02_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16552 bytes
SHA-256: 8285ecac80faeb858e76e09a5b6310e9ca200bb3db6797b11360ae80f2cffbc3