Malicious PDF — malware analysis report

Static analysis result for SHA-256 73516d7005bf621d…

MALICIOUS

PDF

77.6 KB Created: 2021-04-05 13:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a1456d8bac945a2b7a92cb95ab1e2475 SHA-1: cb5012757f82ffb290970a8a0b4a57c52a033882 SHA-256: 73516d7005bf621d73d70d2f7ad5985831706fafd3b3c363fbc44176e122edef
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a lure for password-protected archives. The document body, though heavily obfuscated, contains references to 'Mozilla firefox browser free filehippo', suggesting a social engineering tactic to drive users to external URLs. The presence of multiple external URIs, including 'fokemale.ru' and 'meetsoda.pro', strongly indicates an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fokemale.ru/123?utm_term=mozilla+firefox+browser+free++filehippo PDF link annotation
    • http://meetsoda.pro/git_commands_for_windowsdb63f.pdfIn PDF document text
    • http://mebets.xyz/how_to_connect_hp_officejet_6500a_plus_to_wifizgk87.pdfIn PDF document text
    • http://fitatuvepejozo.sportsontheweb.net/prefixes_and_suffixes_worksheets_for_grade_6.pdfIn PDF document text
    • http://hallop.xyz/does_nike_donate_moneyfn393.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/multiplication_properties_of_exponents_worksheet.pdfIn PDF document text
    • http://bluebadgeapproval.com/le_voyageur_contemplant_une_mer_de_nuages_prix_originaljkc3c.pdfIn PDF document text
    • http://copyrightnotices-form.com/retirement_withdrawal_calculator_excel_templateo7vd0.pdfIn PDF document text
    • http://haifaiv.ru/vojazisasozivufazotlzm7h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugobafujopelat.epizy.com/catalogue_avon_aout_2020.pdfIn PDF document text
    • http://novinijazop.epizy.com/13007075955.pdfIn PDF document text
    • http://worutagoza.rf.gd/kavokadadonovosoromola.pdfIn PDF document text
    • http://puribobelumisi.rf.gd/navodaya_online_application_form.pdfIn PDF document text
    • http://fedepor.rf.gd/780733416.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/basotomokefow.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/carsguide_used_car_values.pdfIn PDF document text
    • http://vopepogam.rf.gd/2689640183.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/87303251744.pdfIn PDF document text
    • http://xezipunefosipu.epizy.com/zawutadomefebaxufi.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/two_by_two_nicholas_sparks_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/alms_sti_tortaformban.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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 5344 bytes
SHA-256: ef0c7b6bb10fccef6dfc887e30c47a0f7a285a2025717d239a3658d2b639531a
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11732 bytes
SHA-256: 955d1e399e78e9713fe02d5af185aff3d31b8ff05b2ef327b31449a09344f482

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