Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b104bdfaef8a0f…

MALICIOUS

PDF

55.8 KB Created: 2021-03-01 17:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dfca65208f3f83d856706a4f1b0934a3 SHA-1: daf2a5292a05ae30eb86999a2a4f4ba9f0bd9c8b SHA-256: 83b104bdfaef8a0fdcd971401cb25e35919cfa4a40f48d04046ae7cad17b6282
124 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8820

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/award?keyword=a+little+life+audiobook+free+download PDF link annotation
    • http://premial.su/zopobakipinosafafeqdtp.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/95053314136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fcba554990ce.pdfIn PDF document text
    • http://nakanilo.club/how_to_write_a_visual_analysis_of_a_paintingrdz65.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/how_do_i_reset_the_schedule_on_my_pentair_intelliflo_pump.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478685/normal_6004be0f32571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fd22cd8a91c5.pdfIn PDF document text
    • http://itdiscount.info/10533802903l6e8g.pdfIn PDF document text
    • http://originalhallyu.com/95913034155gn2n0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_602c88a094ca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_6019a7c21e4b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_6029fb277c000.pdfIn PDF document text
    • http://mon-fortuneo.best/vifipesetozali7vmqz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_600c8a414db0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovaganobo.rf.gd/singer_tiny_serger_ts380a.pdfIn PDF document text
    • http://romesara.rf.gd/bundelkhand_university_phd_form.pdfIn PDF document text
    • http://xenivut.epizy.com/luxexeraz.pdfIn PDF document text
    • http://punafifa.rf.gd/heaven_cover_boyce_avenue.pdfIn PDF document text
    • http://dipibezepipes.rf.gd/barclays_credit_card_contact_information.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 5008 bytes
SHA-256: a52667d76a29b3a6cc93abdfd56fc02516d800177a8ebee94346ff07771b3577