Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec40cacd4e67607e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 13:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7925fc6b146e4277dba2e1f71cfd3fd SHA-1: 233fdfa0da140c9227ddfd936d0e8f85bbf8891d SHA-256: ec40cacd4e67607e1bc6aa663b850662892f09cdeb39c0acaa8ffe4a81d8afad
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt, likely directing users to download further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://florerialafloresta.com/ckfinder/userfiles/files/36752929300.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/89338578101.pdfIn PDF document text
    • http://net-work.cz/data/file/43487011853.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/14315641483.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fuvarikojunupelagiwipumas.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/63364939010.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/27578759759.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/sopabe.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/96018914175.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/74634417426.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bejexizetivoxitubidu.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/kojanidobegamubomuperig.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/nidabopisozu.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/5710843823.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/fuzabiritowuwuxinipofoga.pdfIn PDF document text
    • https://izr.fr/files/37699466435.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161339921bd01f---31423717329.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/lafixuxubopufuwigapumomo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mebovigusagijim.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/45548969960.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1b1e5a06---40742336540.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/20140627718.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/23992409472.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/42484514644.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/doregedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=spider+dance+undertale+sheet+musicPDF 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_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10832 bytes
SHA-256: 4785c57bb531592e2e317bef003122d76dca1f697896f4b8e0f736e1c9545cbb
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 17892 bytes
SHA-256: e2b367030ccb8cf655ec1aaa2777436c1e4348d09d859ae59d12f09613dafabf