Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23878e90a98566f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 23:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8edd8ada343f7cbe452b5d318fd81449 SHA-1: 852e356f1104ad2493ac09713114b3a7d2652baf SHA-256: f23878e90a98566fe4d0eb218651857e205d136b61c78496556860ba4eda22eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=blacksmith+lab+unblocked+no+flash PDF link annotation
    • https://tarsiman.ee/files/file/kafegi.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jovavi.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/xubafu.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/94227794645.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/38026559995.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/jikewukopir.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/fulivov.pdfIn PDF document text
    • http://abnicum.ru/files/file/75587364506.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/20057990745.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/sagotado.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/8932685878.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/delodajok.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jupasoxamataj.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/lufawubozibo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161322ed7c7810---zenunulev.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/mafipofef.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/90445768065.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/tewomakumamufuvaw.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/15062408306.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qkc8eg2tk94be8sea8e3799sut/3889828289.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/jotonixisewe.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 18680 bytes
SHA-256: 0d146aa561d16f32de9365f57690e874d450ac328d23544a791b7424cee3ad93
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 11024 bytes
SHA-256: 46a76b99583d8029d96bb32c2d86e644b7311c29adef1f653fde8a16d21a7e1c
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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