Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dce70acf6b752ef…

MALICIOUS

PDF

68.0 KB Created: 2021-09-12 19:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1813da60ee7acc131d7e5ed5f68a8e9 SHA-1: 1eac345efeda7f6de27f46a9d50172b8df7e3fb4 SHA-256: 1dce70acf6b752ef21c8a0d599e7e7955e6465f7753529afdb01d95d6a341997
146 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The 'PDF_IMAGE_LURE' heuristic indicates it's designed to trick users into clicking, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The presence of many unknown URLs suggests a link farm used to distribute malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://globalybm.com/ckfinder/userfiles/files/1631435359.pdf In PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/89623938454.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/4055736724.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/92828212189.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/89019667434.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/43232748841.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/jevijuloxepapakolamajobi.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/82359246042.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/10/8857693386.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/sesafukiwibozaxosaj.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/62201500944.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wurogujiri.pdfIn PDF document text
    • http://15881588.com/ckupload/files/49660341582.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/feguwurudolaseve.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/kizesutobodev.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/zaxexekolari.pdfIn PDF document text
    • http://esangsok.com/upfile/files/79055653746.pdfIn PDF document text
    • https://ccskin.com/geektic/files/41026957560.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/6488984740.pdfIn PDF document text
    • http://hejia-ele.net/upload/25780818501.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/81318512937.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/19790077661.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/zanakaxuvedafivefiluxamom.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/30469265053.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/rebagorufazojis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=michat+free+download+for+androidPDF 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_off0000af89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 14060 bytes
SHA-256: c73e58fd136837bfca112a33d69bb0e3e09f33a14965aba1da26bafe6761a961
font_01_sfnt_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 10484 bytes
SHA-256: ef01a9724c85beee840875de0b2e0a7dd5413897e9ced28ae0509d88348bc09a
font_02_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1