Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92b874dd5895fe1…

MALICIOUS

PDF

70.4 KB Created: 2021-04-05 01:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fde553f213840dccbc94ceb02e01efe0 SHA-1: 6d46bf1816ce64e104761f98e67570d8462453f6 SHA-256: f92b874dd5895fe1c75d771ab21d1c38db74b4b95086045f6b414e92055937a1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting and contains external URIs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of numerous unknown reputation URLs strongly suggests a phishing or malware distribution attempt.

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://leonvi.ru/award?keyword=aprendizajes+clave+pdf+primer+grado PDF link annotation
    • https://cdn.sqhk.co/renosopezare/2NtQyid/fear_the_walking_dead_full_episodes_season_3.pdfIn PDF document text
    • http://ru-order-687646765445.art/8335430595653ei2.pdfIn PDF document text
    • http://musofiron.ru/hp_officejet_7612_parts_catalog85yv1.pdfIn PDF document text
    • http://deutschebank-meine.com/62952986170ojb70.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/hheOjbv/hitman_goty_edition_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/hagjvX8/likovekuzemokixizanekerub.pdfIn PDF document text
    • http://astrohelp.space/acceptance_letter_hogwarts5ptmx.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/consumer_credit_risk_management.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/41772086942.pdfIn PDF document text
    • http://luminar2-download.xyz/what_are_the_three_most_important_effects_of_climate_changes5cpu.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/Ojfihjg/zombie_survival_wasteland_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/jgLhbWG/46751465051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_9027fbbd137e486c9a63bdc5b54fc387.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/what_are_the_first_10_cube_numbers.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_3c27753413954a7a98bd74b75f074930.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_ed296926252047a982bf32590e8f84e8.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_4c7f6d0ec698414cbd728a301bd1fea0.pdf?index=trueIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_c8156a1e243c4f9cbdeecb4d24f7037e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/88650170691.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_911087ee12bf461d86115b91d2f932a3.pdf?index=trueIn PDF document text
    • http://kozogasivufi.myartsonline.com/zulagidelupebava.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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 5648 bytes
SHA-256: b68e8c85baa25495a6712c7b543cffe460cbe95419b5b0b15ef598140305a67e
font_01_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 11200 bytes
SHA-256: 1d0b134edce2d45fee2b27ec67cc15c4b82df32d2dc202107413ce9d633ca979

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