Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce68edbf380a8d9…

MALICIOUS

PDF

70.3 KB Created: 2021-03-14 03:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d33663fbdda41b62d393990fd03a817 SHA-1: 8003e855cecbe5c5b1efce8248f738b93b9d300e SHA-256: 3ce68edbf380a8d9b08fb186e169b3e85fa42a441dc8ff93cb184d5e9360d0b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' containing 30 external links. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The embedded URLs suggest the primary purpose is to redirect users to potentially malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=depron+foam+6mm
    • http://foodguideblog.com/405248192029xv72.pdf
    • https://gepogujewo.weebly.com/uploads/1/3/1/3/131382217/4209094.pdf
    • https://damokilusul.weebly.com/uploads/1/3/4/4/134463963/noxugozew-pakixekun-debiwarugiwozud.pdf
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/siwulunokinuj.pdf
    • https://cdn-cms.f-static.net/uploads/4483103/normal_601e7c4c165ef.pdf
    • https://cdn-cms.f-static.net/uploads/4471109/normal_601a406f5b72f.pdf
    • https://bemazinava.weebly.com/uploads/1/3/4/8/134890863/37abf.pdf
    • http://vobigabifinu.22web.org/engineering_technical_report_example_doc.pdf
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/3852841.pdf
    • http://noxaduva.mypressonline.com/12614005893.pdf
    • https://xufipenisugiw.weebly.com/uploads/1/3/0/8/130873979/53d3a.pdf
    • http://agentsecure.space/25736730810jqbdj.pdf
    • http://jinobuzid.scienceontheweb.net/arapa_e_anlaml_kelimeler.pdf
    • https://cdn-cms.f-static.net/uploads/4407989/normal_604645a10190a.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/salelag.pdf
    • https://cdn-cms.f-static.net/uploads/4452173/normal_601966aecd130.pdf
    • http://ashotik.space/23989008473v6ifm.pdf
    • https://tedejewudokas.weebly.com/uploads/1/3/1/0/131070167/tasipi.pdf
    • http://mesanezedid.mypressonline.com/melesamudezirugarafum.pdf
    • https://static.s123-cdn-static.com/uploads/4380545/normal_5fceaf978576b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://minalemifomoni.epizy.com/livro_cabala_mistica.pdf
    • http://wivaxodi.onlinewebshop.net/support_vector_machine_tutorial.pdf
    • http://lomurobutu.epizy.com/jugafafafuliw.pdf
    • http://fijumusuxolegoj.atwebpages.com/advantages_and_disadvantages_of_two_stroke_engine.pdf
    • http://zudegudaki.epizy.com/apache_tomcat_for_windows_7.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_off0000d750.bin
518192260d1cd01d9d02749bba6255f34c5b4c152da007e418fcbc5885d9124b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 4992 bytes
font_01_sfnt_off0000e838.bin
226af088fe877b270d7280db5256a52ac8d6b13c9dfadc9d6760a897a3d2c47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 10448 bytes

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