Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df857cd0eaa64a4…

MALICIOUS

PDF

79.2 KB Created: 2021-04-02 02:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c55a357ad70eb1e9e42509e998507581 SHA-1: a162a6bbb02481f4d37790d3de785a43c3dd6e50 SHA-256: 0df857cd0eaa64a4eab85e3e6034efe4126736c915a7270c3440e6a37ca87c43
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to a site offering a 'free audiobook' which is a common lure for phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such lures. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely involving redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9399

Heuristics 4

  • 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
  • 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://ponafet.ru/strik?utm_term=caballo+de+troya+1+audiolibro+completo+gratis PDF link annotation
    • http://tozonofer.iblogger.org/23367889110.pdfIn PDF document text
    • http://nefetenebubuwid.iblogger.org/72729456680.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/hUhghdE/polyatomic_ions_worksheet_with_answers.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/tesumoperez_tajuxipifo.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/gzYqNhj/lefovasu.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/cateter_venoso_central_cuidados_de_enfermeria.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/gexijezixupi.pdfIn PDF document text
    • http://zuberisuxivaki.scienceontheweb.net/natural_numbers_and_whole_numbers.pdfIn PDF document text
    • https://tepadomuxufebe.weebly.com/uploads/1/3/1/3/131382092/886262.pdfIn PDF document text
    • https://rurinigumiza.weebly.com/uploads/1/3/5/3/135350695/3148122.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/QGDhaWS/zotifigukebekit.pdfIn PDF document text
    • http://repovor.22web.org/jack_reacher_never_go_back_2016_yts.ag_subtitles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd60e9339d78.pdfIn PDF document text
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/wadixikovub.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/how_to_program_remote_for_liftmaster_myq.pdfIn PDF document text
    • http://nugawijuxuv.mywebcommunity.org/wordly_wise_3000_book_5_lesson_6_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_600d0c17cb812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63284f1c-b5ca-4a3d-b075-81c83601d895/68189660013.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/maxogututa.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/learn_portuguese_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7edc2fa-0f1a-4ac8-9469-a285d5e37adc/41662385266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f1f630-16d3-4ced-aa32-cca4433f1cbe/18605930560.pdfIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 5592 bytes
SHA-256: effd07710888a59f781605efee014234051b1cd19a1ec242cb76a48ea4f376bf
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 11904 bytes
SHA-256: 269581a3ea9f15d8275dd58b56cc39120ecf431452ee01a22bab9a8d6de06910

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