Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50234215bde05ce…

MALICIOUS

PDF

70.3 KB Created: 2021-03-01 21:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8b63d3d6fcfce8fd852a8c37c36e1f SHA-1: 571ac6ea1546f07fb6113aadd26ec2733a1c4a6f SHA-256: c50234215bde05ceba3af117afc8ca6cdd0640977c1bd95b10d670e912ee1397
164 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a link farm designed to distribute malicious content, with one primary URL pointing to a potentially malicious resource. The 'SE_INVOICE_LURE' heuristic indicates a common social engineering tactic to trick users into interacting with the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vilenefex.ru/wix?keyword=ecological+pyramid+worksheet+pdf
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/jesev_begenimenoluto_tulilexi_rorukor.pdf
    • http://bowemesuzot.iblogger.org/boca_juniors_vs_atletico_paranaense_formacion.pdf
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/budedeti-tonaxu-lerilepute-tepavukozitaj.pdf
    • https://cdn.sqhk.co/norowitidot/PWmjijj/car_calculator_with_trade_and_taxes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rujimidujek/fuperudepomarite.pdf
    • http://xalimelipuv.rf.gd/the_handmaids_tale_chapter_16_summary.pdf
    • http://tonaxoguzigep.epizy.com/nunipitelenug.pdf
    • http://zixupav.rf.gd/why_wont_my_child_follow_directions.pdf
    • http://xekubot.epizy.com/wivaxediloxivikek.pdf
    • http://loxosufodu.epizy.com/bnha_villain_oc_template.pdf
    • https://s3.amazonaws.com/fekazudabo/oblivion_imdb_parents_guide.pdf
    • https://s3.amazonaws.com/fomaralunex/73908857556.pdf
    • https://s3.amazonaws.com/ladojenefe/conjunction_exercise_for_class_4.pdf
    • https://s3.amazonaws.com/sojenozap/gozoxipedavarake.pdf
    • https://s3.amazonaws.com/sugowubuf/narafurenorojaxuretejunit.pdf
    • http://jasetaroxakil.rf.gd/cade_simu_2._0.pdf
    • http://fapubogodomeduj.epizy.com/tetagoduwomiz.pdf
    • http://zepenolewiri.epizy.com/27623268308.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c119.bin
c123c2c0d1d95a18a942d2eebe8d0fa0ac4d6b9de597a3e50e8f19ec1e968959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC119 5784 bytes
font_01_sfnt_off0000d4c4.bin
47db4909b6c65e5dded73dde87d61af1fd0af56e94dd942213a82ea6bd6bc99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 9460 bytes
font_02_sfnt_off0000f545.bin
bbc8a377ea308525ea4a093a1cfbcbef18081e68dbc1dc7ef94177a4c93541e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16448 bytes

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