Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c982cfa453be1a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 17:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 31f116d913ec1f2b412924d378459859 SHA-1: 7a131da61aea48e24acc4886913ea9bbb7cb9833 SHA-256: 26c982cfa453be1aafc7276059f63ba81e1dec47b0f2ac1204b8901076c39b45
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the PDF as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://gimoguvi.ru/award?keyword=physics+of+fluids+pdf PDF link annotation
    • http://ezfix.asia/procreate_app_storexqp3y.pdfIn PDF document text
    • http://bloomwithdeanna.com/bowflex_xtreme_2_for_sale_usedafbm7.pdfIn PDF document text
    • http://zabumufunesomud.66ghz.com/pivot_animator_4_backgrounds.pdfIn PDF document text
    • http://libidisebosuv.22web.org/pdf_solution_statistics_and_probability_for_engineering_applications.pdfIn PDF document text
    • http://faxadiweruxu.22web.org/selozulofe.pdfIn PDF document text
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/ce42baa.pdfIn PDF document text
    • http://save50it.pro/xulotikebibobung8br3.pdfIn PDF document text
    • http://kreativoblako.com/very_mom_seed_ceramide_mask_sheettrrhn.pdfIn PDF document text
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/6736664.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/7113868.pdfIn PDF document text
    • http://all-gopro.com/plot_diagram_examplec0nxm.pdfIn PDF document text
    • https://duvigefotazepex.weebly.com/uploads/1/3/0/7/130775674/jezoxunaget_selafova.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/wutomugived-pisoteru-lelutabuja-wapimojunasotit.pdfIn PDF document text
    • http://vagiburenumow.iblogger.org/mapufezoriwajezozujagubib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubegamo.epizy.com/roxewozolan.pdfIn PDF document text
    • http://dipibezepipes.rf.gd/win_10_education_iso.pdfIn PDF document text
    • http://jerasopel.epizy.com/egomaniac_vi_keeland_free.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_08ad4ab6f3a04dbd91e2238deb1b239e.pdf?index=trueIn PDF document text
    • http://nazonuretowu.epizy.com/regulatory_reporting_analyst_salary_london.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_012a140e0a944b388ed55c3cfce8ef2b.pdf?index=trueIn PDF document text
    • http://nodikisiti.rf.gd/how_to_automate_android_application_using_selenium.pdfIn PDF document text
    • http://jabisuluro.epizy.com/reporter_loses_it_with_scientologist.pdfIn PDF document text
    • http://konoxebajokebu.rf.gd/how_do_you_cure_trichotillomania.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_9aa32802de3d47b88de15ae95def759b.pdf?index=trueIn PDF document text
    • http://zasuzutan.rf.gd/difference_between_poisson_process_and_exponential_distribution.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_bd2704f1e3424760a54a00be90243316.pdf?index=trueIn PDF document text
    • http://xemaneruweveji.epizy.com/trig_graphs_worksheet_answer_key.pdfIn PDF document text
    • http://magotabitujotu.rf.gd/los_angeles_city_business_license_application_form.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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 5040 bytes
SHA-256: dad2ff77aded5a4692e4a6e6f9cde17906a02ef9af61744719f7386e59a2f823
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 9924 bytes
SHA-256: 4cd90876fde3e1caf7f176e3f31f87996309bd7d3afe75533aea17b89e9d4180

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