Malicious PDF — malware analysis report

Static analysis result for SHA-256 207a7970734fba52…

MALICIOUS

PDF

78.4 KB Created: 2021-03-12 21:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 54788a0a02fb1b064c604d40defcd0c5 SHA-1: 4609ba1ed36b0d477480be62d3d27052755b44f4 SHA-256: 207a7970734fba52105359b2615d8302141266cc4e5b563a1c2ab879f3f01c64
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to paleontology textbooks and the wkhtmltopdf application, likely a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://seumenha.ru/award?keyword=paleontology+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488130/normal_5fe7f5a9dab2b.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/nimodipine_subarachnoid_hemorrhage.pdfIn PDF document text
    • http://juxisuzuvu.iblogger.org/880157988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_5fda7905dd432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5fc7a2d19754a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_6032f13b347b4.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/59657870310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_600bf8bac382f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilutibu.onlinewebshop.net/duwemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f94f712-889f-46a6-8ea0-80a0a0970434/23136803387.pdfIn PDF document text
    • http://rukudukewa.epizy.com/cengage_organic_chemistry_part_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/funny_books_for_five_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/putekogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c934e4f-3210-48ef-90ea-08cb35fdf045/xobowoganat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2a08d2-8464-415c-b01e-5dad6fc09591/544710537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fbd018c-bcea-4875-84b9-544890fbb1a5/21190498395.pdfIn PDF document text
    • http://pufigopinenise.epizy.com/arts_and_crafts_for_high_school_students.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 5312 bytes
SHA-256: 7fee9ffb6d6f781913cb04a3a51d18efd33659cedf0c3ad9b816fa06dfc4de90
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 10264 bytes
SHA-256: 266edc4318a462cb595612491809d11007d89bd00a0269bbbf2fff34a80e902f

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