Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f93f0639f810a0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 16:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d2dc6547328df337c9d780a8b003eacd SHA-1: 8f524e978e1a090c139c6983dc69fbc277d21490 SHA-256: b3f93f0639f810a05beb75d56f2ef6ef7186496438dc21c44191e70c45c5b645
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://healthmatters.me/userfiles/file/30511958604.pdf In PDF document text
    • http://travelcenterpuntos.com/campannas/file/37476255450.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/mefoviju.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/69126391528.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/87324431299.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0a5031d22a7c74c53736803b72da79f3/29827762549.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/feturemotaruwizakesi.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/lomofakenonatewo.pdfIn PDF document text
    • https://oasis-travel.ro/files/89275141387.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4kb6hfhdeuh8es63ugohcleph/ziredapun.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/lisewodab.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/jufobajabejarasolebuwaful.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/javobajalupabefipivuwu.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/72725511772.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/67510681601.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/mamefidevijereli.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/pusafigamu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jinex.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93026912123.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/45924405579.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/26552251603.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/bosere.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/59573277186.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/77478647506.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/faduvalasumexatevizije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=english+story+for+intermediate+level+pdfPDF 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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 18244 bytes
SHA-256: 3392ad2cd0b0ed166d85f2f820b9027bca6cd42013cdc0742dfd58eb45409e0e
font_02_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 11108 bytes
SHA-256: 523f4fac68a3cab65673da5e4ba94eb5e5993543bef172724d3755f3d1de8300