Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdadff504d871a97…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 11:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c7152f84411aa25943a6e0a80abdbd6 SHA-1: bf8ab7034b81340a47b87d015ffed6b7bc82a458 SHA-256: cdadff504d871a9716458f9689b1beebbe49206383172742d599ff5fa89e503f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The primary purpose appears to be directing users to a collection of other PDF files, likely for malicious SEO or distribution purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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 http://woodwork.pl/ubezpiecz/obrazy/file/siluvaviluwifow.pdf In PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bominaweponufujobigonupu.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/61084082056.pdfIn PDF document text
    • http://smirna.pl/files/file/sikolidatizavisuxabunuxin.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/85971169642.pdfIn PDF document text
    • http://teakdeck.pl/files/file/kitagajigefuravesebo.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/zububikopikodaduzagad.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/17756636246.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mibivipilugetuwusuvadil.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210906_5479CFEC9DF1CB0D.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/98718238417.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/gobotot.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/70243134193.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/89ab515cbfd8154cf29a21be4cf55e52/ruluzanazeridafezugupa.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/11522077032.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/bawone.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/rujuzuderojigalib.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/70735126919.pdfIn PDF document text
    • https://trexanh.net/upload/files/95360140924.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210902133249.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/faboxikesekivu.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/navano.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/molajaxemojaxadigodimolu.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/kolipulemase.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065ddc5647---vemujagotejujuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=poco+x3+ringtone+downloadPDF 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_off0000c7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 10736 bytes
SHA-256: 29b84c00960929191ddbd681638371b4f3b7b6472ebcf39517c14682708a9036
font_02_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 16740 bytes
SHA-256: d3793ce010b616c3e01273505c97afaea5005deaf0ff4ebf6530597551042b44