Malicious PDF — malware analysis report

Static analysis result for SHA-256 653e73b00edecf96…

MALICIOUS

PDF

74.4 KB Created: 2021-09-21 14:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59c7508b30cc6f268ef414c1c7a134dc SHA-1: 238494cf6392c3452f1100c524217dd610a9ada2 SHA-256: 653e73b00edecf969b19bd503cff293d785de7d01c76fcce9143910bd52d059d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=excel+macro+mastery+pdf PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/sekerotuvidelo.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/wapotonobo.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ludude.pdfIn PDF document text
    • https://krusomying.com/data/file/96178066958.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/37244844525.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/74266203111.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xolewutorikefal.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614643bd5a70c---davarajokufakivavikino.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/80968344894.pdfIn PDF document text
    • http://usmleworkout.com/files/file/bemudetudepolalatekukariw.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jupiwovinugifawobov.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2b28e68873784235a23afe5bcb863327/gemepabepawudunufujesujit.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/fulosemufusujopebajeneguj.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gixitasiwarukojixekalas.pdfIn PDF document text
    • http://cpviettin.com/upload/files/49466981151.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/15939904576.pdfIn PDF document text
    • https://finliz.lt/i/File/wusaxavupopinez.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/nibuvapurariwibaduju.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/guzuzozovi.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/relef.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/88461633968.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/fakexabosixib.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/notariwepiget.pdfIn PDF document text
    • http://unseretochter.ch/images/file/63804124883.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/88920903107.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_off0000c2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D0 10784 bytes
SHA-256: cb6eb9d09a3fdcb5ca39fa96defa16cc840d27ce1aad829bb9a0f61a73f78d4a
font_01_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 16020 bytes
SHA-256: c897ed6d974ced2cf7e77d7d808974c720ee9f3bab81a8d8c286788b9b648d3d