Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b9e34f2878eb38…

MALICIOUS

PDF

86.8 KB Created: 2021-02-26 08:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fcca421da8c511f7d79d8f138491b012 SHA-1: 12198030ca5879927c15ba3720d95015a6716f2f SHA-256: 36b9e34f2878eb3857958aadd48f312aa76d231642d5c03ff5867a7732c518ed
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation and potentially search engine optimization terms, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=is+my+hp+officejet+4500+airprint+compatible PDF link annotation
    • http://sepoxudozixo.sportsontheweb.net/maytag_quiet_series_100_dimensions.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/bose_awrcc1_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_602c25b92d58f.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/hhThdZa/bofalefilosiz.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jaghKhi/switchblade_comb_metal.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/pijabozufegilejemiwubulam.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/ijetdhA/xekiweju.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/delta_plc_programming_tutorial.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/can_a_highlander_hybrid_tow_a_trailer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fd1717bf1d9e.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/bVigBhb/electrical_calculator_software_free_download.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/86692219172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_600b4424c623c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503387/normal_6025a0bcdb9c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/83727854422.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/d-link_dir-890l_ac3200_router.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/17887086712.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/advanced_excel_training_file.pdfIn PDF document text
    • http://duvodix.myartsonline.com/divuwanobak.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/47486323600.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_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 5864 bytes
SHA-256: 52be73e91e2f7568193ac7e9b549411ed129a72b255dd711ad0d71b9ad5cfd6a
font_01_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 11844 bytes
SHA-256: e5cbed011126370876171b8d7d72d89eb53d717f603fde920ae80519f67d910e

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