Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e2a90e933144ed…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 23:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a8658ced11b95f095a8edcee6fb6015 SHA-1: 82aa1384ec2b54d70dcc487f7632c6bdaaf517ae SHA-256: 98e2a90e933144edd953ea1de759cc6a3671b7b10477e4e53f323923c71056da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://hb-hospital.com/file_upload/fck_upfile/file/netosi.pdf In PDF document text
    • https://mywayrtk.com/userfiles/file/wimivugi.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/12389655024.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/dutekemaba.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/16154671896.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/53593125852.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/lewalu.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/21098700015.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109130829073496.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/33927268873.pdfIn PDF document text
    • http://myslizdrave.com/soubory/42105743586.pdfIn PDF document text
    • http://15881588.com/ckupload/files/pizosaxegutizatevoz.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jenigejajosarexuza.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/53228737851.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210924195647.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/puvuwateseneno.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907202842.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109221553242207.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/52113960183.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/12806452263.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/suboginirodavezebodewilat.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/5320425850.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pubapamix.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xuniritararemiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+do+not+disturb+app+exceptionsPDF 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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 15180 bytes
SHA-256: 70812f2b949bacdd09926ee32eda2c1959366bfa8018074ebf99b91bc2d2d3f8
font_01_sfnt_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10784 bytes
SHA-256: a20abca7409ec362a61d527bd9555e9759d6cc327ad2ae48716be56b75a449a5