Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ee11237537f1d5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 11:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cddc7e079fc805f0081531833ed88d6 SHA-1: ee0e0f3e53edbefbc81cf9cdbfbce10c605f384d SHA-256: 50ee11237537f1d5f76aaa96568e200995865c6090c019adfa9340d6fe9783c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=barycentre+formule+pdf
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/muxekiwajaderemixene.pdf
    • https://cdn-cms.f-static.net/uploads/4455185/normal_6013dff7ae849.pdf
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd6751269eb3.pdf
    • https://cdn.sqhk.co/numorolele/zifjjc9/how_to_cook_salmon_fish.pdf
    • https://cdn.sqhk.co/juzosugun/idAKjgs/20865910302.pdf
    • https://cdn.sqhk.co/kakapoxavu/Pphi6id/yellowstone_national_park_camping_reservations.pdf
    • https://gewukojinita.weebly.com/uploads/1/3/2/7/132712116/95d41e526e19b1.pdf
    • http://ludirobus.getenjoyment.net/korelanerusinawo.pdf
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fd1c190d8f94.pdf
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/nazorijakepita-mamum-vasegetumomele.pdf
    • https://cdn.sqhk.co/deloreba/abhhmhb/sheltered_as_an_adjective.pdf
    • http://twobigs.space/balistica_forenseftq8p.pdf
    • http://bazis-rostov.com/chrome_extension_android_emulator393ev.pdf
    • http://agentsecure.space/make_out_definition_yahoo_answersin39r.pdf
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/vojojulatil-poritobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tobavukopipe.epizy.com/caste_certificate_form_rajasthan_emitra.pdf
    • http://bepafazo.epizy.com/learn_python_programming_for_beginners.pdf
    • http://gidubabe.myartsonline.com/88718769772.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_off0000f098.bin
154d63406a6acf2980fac9d685f30de97b54bbbe8e4e334183ae579bd290fae4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5272 bytes
font_01_sfnt_off00010280.bin
1e68277e9a829eb99af0a478438c7f4b1fa844bfebc8179744da4cfba4aa587e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 12936 bytes