Malicious PDF — malware analysis report

Static analysis result for SHA-256 033b73b6b26e2e57…

MALICIOUS

PDF

89.1 KB Created: 2021-03-17 09:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c644c649852a8fd24ecc34e0485e7715 SHA-1: 1f51d53008b9efb8608699fa70614b55a4bb0ac1 SHA-256: 033b73b6b26e2e5703bf75c65dace7af403e020c6d74b4f2b73cdb7c9160a7d8
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 numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=7th+grade+science+cells+unit+pdf PDF link annotation
    • http://parkji5x.xyz/sexovowawuziniretn2cn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_600e90eb8abad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_60030905a733e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5fdb65c758dde.pdfIn PDF document text
    • http://setlyb.online/savibasosusulyac3l.pdfIn PDF document text
    • http://givepamodugag.22web.org/minutes_of_meeting_template_ms_word.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UT82heh/duvizinopunobopu.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/ihpFmih/fekoluwukamojo.pdfIn PDF document text
    • http://csxmoney.info/how_to_plant_sweet_potatoes_that_have_sproutedxihbb.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/gdX8hdR/24861399389.pdfIn PDF document text
    • http://agentsecure.space/mixet2hdio.pdfIn PDF document text
    • http://ruszaimclub.ru/xugaduleberotujicrmu9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6011de463937e.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/hFhitgN/cadena_100_madrid_direccion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rodukamofuf.epizy.com/best_ereader_for_and_epub.pdfIn PDF document text
    • http://xewofikedufika.epizy.com/determine_the_standard_enthalpy_change_of_formation.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_509fa7f1d8804ea484c79dc5fada1a18.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_0acaee579204414aa01de317f7cf1364.pdf?index=trueIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_867e907be9324c80bfb3e4860d7cc69c.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_eda8424fc6dd49d88546ac595d96955b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 5176 bytes
SHA-256: bc5b865abd3be56baf5c632429361eb51225d885bbeac765ac7b49f2f4e71848
font_01_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 11976 bytes
SHA-256: 782093e3dcf6d8deb7bab71a1eb4de866cc370aba83633fa7ad271ff0a7ffa30
font_02_sfnt_off0001483a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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