Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8f9d4902c10e97…

MALICIOUS

PDF

79.0 KB Created: 2021-03-28 15:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9cd790035d5a4539e7146b1790c5eb11 SHA-1: a290a6baecf0a1df61e770c4566de5a3bc443dec SHA-256: ec8f9d4902c10e97b16f6710137d7c9285a455ae57713e2d7aa3e8b2ff775722
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a book summary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://jacksth.ru/award?keyword=built+to+last+book+summary+pdf PDF link annotation
    • http://femuxeririta.mygamesonline.org/verbe_irregulier_anglais_francais.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/health_assessment_carter_center.pdfIn PDF document text
    • http://domastmsk.space/688667760056xq4s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5fdd8e13b0c66.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/how_do_you_troubleshoot_a_deep_freezersusnr.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/fotobivumukuneruwupop.pdfIn PDF document text
    • http://c-advance.space/telugu_movies_dubbed_to_tamil_freevmzx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_605045f93f380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_60318f9f4a4c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_604ec1be92496.pdfIn PDF document text
    • http://trells.space/75451196025uc1wy.pdfIn PDF document text
    • http://redit.fun/jifowabupamijonegoferoubj.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/27194087115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/mh_cet_2019_application_form_last_date.pdfIn PDF document text
    • http://gafijid.atwebpages.com/propaganda_techniques_in_today_s_advertising.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/mcgraw_hill_education_answers_chemistry.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_fd271716d5ea4f5488780a061dd3dd16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aacb1e0-a786-4b2c-bc6a-c7dbfa8f908e/76340564231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79276f4b-aed0-4f27-8f98-5fbc8b02b359/64809871607.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_beaa22cf54d5459e888e56981b7f1e65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazemi/tma_slope_indicator_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a08fe31-4d37-432a-8e1d-dac22585f65c/jotewagi.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/pulse_oximeter_sensor_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c545fe2-6024-4160-bd47-52b070bed795/how_do_you_add_improper_fractions_with_whole_numbers.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_8c488586717649d3b64a49efd39e4b6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/codicil_template_to_change_executor.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_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 5540 bytes
SHA-256: 7b416d8bdb116f4b4453267e63ff27f5197b8a6aba4e3ed02f983758b69594a2
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 11420 bytes
SHA-256: 4a4b49d8c2a0b8978b2f47bc46ed39b171f91bba04f7d0aac7c970a82468a9b9

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