Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8dca7f1efce1a8…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 14:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1d136e84e56447553b490bee484c71a SHA-1: cc53fc072d8e7acec59126b2c6bb8c92872a43bb SHA-256: 0c8dca7f1efce1a83bf0fb3c462ceacef911613359fc7a6d3af666bf47d16c9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is a link farm on disposable hosting. The numerous extracted URLs, many pointing to suspicious domains, suggest the primary purpose is to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+to+block+porn+sites+on+android+phone PDF link annotation
    • http://ohmytour.kr/FileData/ckfinder/files/20210901_EFBEEE80337DDB9B.pdfIn PDF document text
    • https://renault-service.com/userfiles/96770705923.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/65494502290.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/65315392240.pdfIn PDF document text
    • http://patroha.hu/file/kematugobegasoxe.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/majupuvaguvum.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/79230356690.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/xowepuwuboridolebanafob.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8285adc6d1b180a83a97ff1e4cf5fee0/73610142893.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/79813162755.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/bajusepafoxawuwupolebitow.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/1731508693.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/xobizibonitove.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/81114594120.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613237f5cba9e---munedawekidi.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/24949779042.pdfIn PDF document text
    • https://phuquiland.com/upload/files/41061065427.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xijejosonemixe.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/kasemenimaj.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/farikevupuja.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210910143335099716m6e1hzo3097r.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/19477162943.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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 10920 bytes
SHA-256: 595a959d8f635744ca817910dff10e55abf0730e4e3a37e8bc94bdf10be489a9
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 17656 bytes
SHA-256: 27add4c6e1d146fabf43967eca10f913a5adbf454071b36feb120c8a5e0ad8f7
font_02_sfnt_off00012df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.