Malicious PDF — malware analysis report

Static analysis result for SHA-256 74859bb73aabfb7d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-23 14:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12cd52350b5bc0ab69e2d0431cfd78c5 SHA-1: bfd38bc22ec28504fbe6aa5fe32c8c858680e7ad SHA-256: 74859bb73aabfb7d14e3583ba37485b9f70935ba3437f5c89108bc76c0a75ae1
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to unrelated domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'tables in maths' and the authoring application 'wkhtmltopdf', which is often used to generate PDFs for SEO purposes. The presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://midufefew.ru/wix?keyword=tables+in+maths+1+to+20
    • http://lenusabipowezo.getenjoyment.net/duxupupobujusivevetiwag.pdf
    • https://watubozez.weebly.com/uploads/1/3/5/3/135346011/e1c4d.pdf
    • https://static.s123-cdn-static.com/uploads/4410714/normal_5fcd2f70c90a3.pdf
    • https://valazasabo.weebly.com/uploads/1/3/1/3/131398294/kobej_tovome_xawipavabep.pdf
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/c01d0d556c4c1c.pdf
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/mepad.pdf
    • http://neridofufuleteg.scienceontheweb.net/o_que__anemia_perniciosa.pdf
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/86419.pdf
    • https://cdn-cms.f-static.net/uploads/4448556/normal_6056212fe8de0.pdf
    • http://firejifanop.iblogger.org/how_to_reset_gamesir_g4s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fonibinaraj/niwemomudo.pdf
    • https://s3.amazonaws.com/zarevizebi/dietary_guidelines_advisory_committee_scientific_report.pdf
    • https://s3.amazonaws.com/bodajaku/craftsman_6.5_hp_lawn_mower_air_filter.pdf
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_4ba8da9644524ec9ab2386b5802c34b7.pdf?index=true
    • http://sikirubuguje.epizy.com/14423685582.pdf
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_0c2a6e5ccfa5457c8252ec354bc25ce7.pdf?index=true
    • https://s3.amazonaws.com/zerejibixupav/jabuxodafituferez.pdf
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_53e5598213814eb7878c546f1a3ba034.pdf?index=true
    • http://piwakitidi.onlinewebshop.net/why_does_my_samsung_refrigerator_not_making_ice.pdf
    • http://rebobimakefeli.epizy.com/65113414557.pdf
    • http://bulizodizizudid.rf.gd/76955137121.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec14.bin
66bd77e846ec482c3f06295a3a4f188186aa9ffd39d5df50db5b1c9ade143372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 5244 bytes
font_01_sfnt_off0000fdc7.bin
e23b022b6de3cdaad07dbf893bfbf764fe182fc2fc1e0a8ff815681684712658		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 10932 bytes

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