Malicious PDF — malware analysis report

Static analysis result for SHA-256 d534c83df5e88541…

MALICIOUS

PDF

62.8 KB Created: 2021-02-23 00:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c14d2d3d936adc9eb9fd30950abc6a3 SHA-1: 4668e0922d94ac10152f313cfd88cd77d977e155 SHA-256: d534c83df5e885418af499af641f364e5920ddfea76e1a9099c3aabb77027040
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, including a link farm hosted on disposable domains, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to product specifications and application details, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=plantronics+explorer+505+specs PDF link annotation
    • http://vseti.life/mxq_pro_amlogic_s905_4k_tv_box_firmware_updatelijaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_601fe76c5d09c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_602d9936ea601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459792/normal_5fed99873a2ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5fd761f87c474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5fedba4c6de5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_60258c5531755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5fdee69034bc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_600e5f10f31d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexiwukivenuxaf.rf.gd/pexojofefebipekot.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/portador_de_anemia_falciforme_tratamiento.pdfIn PDF document text
    • http://bejopirobi.epizy.com/ny_times_crossword_puzzle_answers_today.pdfIn PDF document text
    • http://wiroweri.rf.gd/get_bundle_fragment_android.pdfIn PDF document text
    • http://vapilazomenotak.rf.gd/xunatij.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_off0000b79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 5260 bytes
SHA-256: 5b2cd2139ea0f736bb6c907d96bf9f899b3d684e326e34746098bb79b1af87c4
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 11124 bytes
SHA-256: e4b5e42d813d0397bc380ed0ea241f63519932a92e5779a8498badf7c4ce0fc2

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