Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbbf5115eff074b…

MALICIOUS

PDF

79.7 KB Created: 2021-03-12 17:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 464c9a597798116d11c8e37343315c9a SHA-1: e98f88720238757aa683c3f67e695939932969e9 SHA-256: 7cbbf5115eff074ba9ffa2e76603835c9cd48818b626a193bb34253554d16af4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=translate+google+app
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/penafixi.pdf
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/3183235.pdf
    • http://tanolugulutewu.medianewsonline.com/cv_format_for_students.pdf
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/vamevupomeba-bozorok.pdf
    • http://rumafelaneli.mygamesonline.org/compass_application_pa.pdf
    • http://woxuruko.medianewsonline.com/what_is_quantum_tunneling_simple_definition.pdf
    • https://cdn.sqhk.co/wemonamo/ajhPZqp/vufalodagatolijumo.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/mimovopa.pdf
    • http://zomolejefej.mywebcommunity.org/sample_recommendation_letter_for_scholarship.pdf
    • https://cdn.sqhk.co/jeforije/jjejfjh/bobopesawe.pdf
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/pezisuwiwujezedu.pdf
    • https://cdn.sqhk.co/lerotakisisa/NijjeNn/dutitowujajemutut.pdf
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/4701351.pdf
    • https://bowemubunewoseg.weebly.com/uploads/1/3/0/7/130739536/jezixaka.pdf
    • http://kulanefimolon.mypressonline.com/best_free_crossfit_programming.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://novupomajanox.atwebpages.com/pulp_fiction_biblical_speech.pdf
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_15f8b2a2d8ad4bdfba997a288a4ed6be.pdf?index=true
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_0aa9ad9d1716439da74e33dfeedc4c26.pdf?index=true
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_0ee182a7d0fc4240a4a85bfae89413ef.pdf?index=true
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_7725233448194d7e991354fe887acd65.pdf?index=true
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_de6e49ca8dc140c38edfc629a8cf5375.pdf?index=true
    • 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_off0000fb1c.bin
b7fcb8318ac4643ad7a30810a561e33422767d69b39062a9fee166ec88d91185		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 4936 bytes
font_01_sfnt_off00010bf6.bin
ca577c1af312b5bd505ce33ba13d5f4e46dba839dbf88a87b173b54869f38964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 10836 bytes

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