Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb14d3b939e3f6c9…

MALICIOUS

PDF

84.3 KB Created: 2020-12-21 15:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 54788e80d156b9bf70d63099f9172d4d SHA-1: 624fda38f80c00fd9145b7a1d5cad69e44931ed7 SHA-256: bb14d3b939e3f6c9fdc5ec47fcfc6f9a576807e4e5404b931fa6c958fa8eec43
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffking.ru/123?utm_term=fortnite+hacks+free+v+bucks PDF link annotation
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/ffc16b49256f.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/lodufoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_5fb53610d6659.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/gewenibusifumoz-vulukevemeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5faa36b45a484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fdbcaec7cdf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_5fb4c3029d4fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fcc70962bf39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7df039-7aab-4e81-9087-33f34e2fb191/wunuwivoturifasakala.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/zen_and_the_birds_of_appetite.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4086b97992eb55bb7f9/t/5fc120921972c46e3cc68bfd/1606492306961/depumadavazufaxexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73da5fdb-8639-448d-ace8-6b9a23b25103/39238376271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d85581-9776-4cb0-953f-e4285d3b3161/vexikopupijejuk.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 5156 bytes
SHA-256: b3686c347f067d327e0323379fe8b05dbb2668b6afdbcee402cff619f6b94fa4
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_02_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 11320 bytes
SHA-256: d1ba812354482c0b28daeb90f50a2e3da8a2f739643ae71852a1a82839acef03
font_03_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 16116 bytes
SHA-256: acdc7345fd7c724e0f83f99756c334a81566d7f1ced1780f830934d9e28cbf4f

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