Malicious PDF — malware analysis report

Static analysis result for SHA-256 9271f3efc8af2d63…

MALICIOUS

PDF

72.2 KB Created: 2021-03-27 12:30:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e590a45696e05345b9b8748808080606 SHA-1: c2103b49903d96ee25caff2efff309362b39a625 SHA-256: 9271f3efc8af2d633accce73b1672b23a6ea5a0a704d9b9b7450edb3f5b8de7c
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting it is part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7833

Heuristics 4

  • 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
  • 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://resalured.ru/award?keyword=ielts+speaking+marking+criteria+pdf
    • http://lozolupamo.mypressonline.com/dipemegame.pdf
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/4591234.pdf
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/lufowakuzazevaperub.pdf
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/raruwofedixi_wurukuno_vibogitiz.pdf
    • http://vivekawiga.sportsontheweb.net/basketball_dictionary.pdf
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/miwufuguxed.pdf
    • http://dawexefif.getenjoyment.net/1.garmin_nuvi_2597lmt_vehicle_gps.pdf
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/nepitodafamezurupa.pdf
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/4980601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0018d95e-a5ee-4d49-809c-fd700ff3b2ef/2nd_grade_singular_and_plural_nouns_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/2dfe3362-d013-46a8-9986-b47f83d156f1/rirexekanapabuzimenekeg.pdf
    • https://s3.amazonaws.com/gonasidupij/39094397773.pdf
    • https://uploads.strikinglycdn.com/files/aa2b38dd-ed24-41ec-9161-b206b2139b86/naloruxutil.pdf
    • https://uploads.strikinglycdn.com/files/f20a0ccd-68a9-4e37-91ff-de385b7b7952/dajulotav.pdf
    • http://gumusimigogasuz.onlinewebshop.net/nemuxagufomi.pdf
    • https://s3.amazonaws.com/sevoga/pusidadufod.pdf
    • https://uploads.strikinglycdn.com/files/1808d663-33c1-4650-baac-6ff00195cd2d/mn_dmv_road_test_schedule.pdf
    • https://s3.amazonaws.com/turip/sheet_metal_hydroforming_machine.pdf
    • https://s3.amazonaws.com/bezegoluzose/wujevikavusujobojutiwase.pdf
    • https://uploads.strikinglycdn.com/files/700b38ba-856b-4f94-99a9-692ecbf95bcd/tc_helicon_voicelive_2_with_vloop_price.pdf
    • https://uploads.strikinglycdn.com/files/cde95d2e-93a9-4548-a656-db3802373eec/ielts_writing_task_1_general_sample_answer_band_7.pdf
    • https://uploads.strikinglycdn.com/files/852438de-92a5-4e1c-8b06-0d980274302f/unitedhealthcare_mississippican_prior_authorization_form.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f276.bin
540795f22769e715588eb54a622ba3b97c8cbc916e1f62318a326f889a0ac70f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 5476 bytes