Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba5ff89b5cd653c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 00:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ab6ea728d97adb7f6b2a1224353ee00 SHA-1: 5dcdba69e9fddb38adab683b31945ef25b72945e SHA-256: 4ba5ff89b5cd653c3578746f57c54f81fc07c5dfe6ca6f55f01f98512309b958
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://contactfm.be/userfiles/files/94988345379.pdf In PDF document text
    • http://cellesekorea.com/ckupload/files/79048485676.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/zuxen.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/86537300147.pdfIn PDF document text
    • https://energooptima.hu/upload/File/ledulokifemonuvoxizefin.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/sudezimotefedome.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020202433126.pdfIn PDF document text
    • http://bubb.cn/up_file/file/fonuxop.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/lulasojisur.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/fexofijikeleziwimow.pdfIn PDF document text
    • https://raljob.com/userfiles/file/gigubaxavupibojefe.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/93798513009.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/48238706460.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/67165527164.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/ruwabifiwigavuza.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe7043d2---43057725589.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/ronowuwira.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/kolewexasudo.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/surekidebumonexamuxa.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109061410085557.pdfIn PDF document text
    • http://01host.ru/userfiles/files/sebinegizezelibib.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/zirunulexezovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kindle+premium+apkPDF 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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 17344 bytes
SHA-256: b2e6b7bd3e41b33da48eccb7a835e9c09725b1e5263efbb06597ab9df22a628b
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 10352 bytes
SHA-256: 9107eaa179e05a29c28dbabb77efafb26d11c6923c8ef688610a126a9e39d8bf

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