Malicious PDF — malware analysis report

Static analysis result for SHA-256 be41f9b617642ca0…

MALICIOUS

PDF

77.4 KB Created: 2021-02-25 17:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 143444f53dc8e58389c1cf59c0269e7d SHA-1: 91cbbb7a2fb63df76953866fef16602d95e960b3 SHA-256: be41f9b617642ca09a5bbe70815612485ee9af9cadf9a20874f7ff3ad22e96b8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=genie+pro+screw+drive+learn+button+broken PDF link annotation
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/2116e6b3000.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/13224677023.pdfIn PDF document text
    • https://jaxuvoxet.weebly.com/uploads/1/3/5/9/135979876/9c1caaf807fa884.pdfIn PDF document text
    • http://mamontov-net.cc/bell_tent_sewn_in_groundsheet7oi9h.pdfIn PDF document text
    • https://verukutuxa.weebly.com/uploads/1/3/5/3/135330203/nukivatix.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/lg_soundbar_nb3530a_mounting_bracket.pdfIn PDF document text
    • http://gebovoxitim.22web.org/sonda_vesical_de_demora_tecnica.pdfIn PDF document text
    • http://vsyahakasia.info/peripomoduxiliwerumo8wb0.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/briggs_and_stratton_vanguard_23_hp_carburetor.pdfIn PDF document text
    • http://in-arenas.com/bufofih7fbl.pdfIn PDF document text
    • http://dixajadabaw.66ghz.com/organic_chemistry_with_biological_applications_answers.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/how_to_adjust_singer_4411_sewing_machine.pdfIn PDF document text
    • http://izzzaaa.space/dosubogovenifefaxamiguxenqk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desasivitusuzux.epizy.com/is_it_ok_to_eat_kimchi_when_pregnant.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/57480658667.pdfIn PDF document text
    • http://jiwuboro.epizy.com/10321506379.pdfIn PDF document text
    • http://wasaxeradiko.rf.gd/daxipeguzawuzawuzom.pdfIn PDF document text
    • http://vanidedafi.epizy.com/66518343990.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5452 bytes
SHA-256: c5c2648316149f538e3bbdb704efdffcf175eb2559a38f8cc0caacf6fff126f5
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10480 bytes
SHA-256: 91b4e7b858c939c025812bfe1a3ce411712c9507cb6d9a559fa8c17af1541de5

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