Malicious PDF — malware analysis report

Static analysis result for SHA-256 837793171479d7c6…

MALICIOUS

PDF

72.5 KB Created: 2021-05-11 04:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 89a6b0f8228f320ecc6262b3bf688f41 SHA-1: 2789f5b5ca52a627a23a2a7ea006890a6b173fbd SHA-256: 837793171479d7c66f3836e8001f419987780682e0d9a536f3af13b8d51a6d10
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://ponafet.ru/strik?utm_term=metric+system+conversion+worksheet+answer+key', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, suggests a lure related to a 'metric system conversion worksheet answer key', aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ponafet.ru/strik?utm_term=metric+system+conversion+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/vumuwilaj/oibjhqi/launch_schedule_cape_canaveral_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/dicG5if/nusojudopefibujelase.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/TK0hegc/rose_gold_boot_covers.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/5165ae4e-2731-445c-9ca2-235025d39ee3/doreen_massey_for_space_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/buwek.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/diwefinoditimin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9620df0-ccdd-4668-851e-0265bb45c7f3/systems_engineer_1_boeing_salary.pdfIn PDF document text
    • http://bemawom.rf.gd/purble_place_online_free_no.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83f2611-2410-4cdd-860b-a8850951d431/2096986816.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/59062193756.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/rusopetawupuxosorevopi.pdfIn PDF document text
    • http://punegejofuj.epizy.com/ny_real_estate_commission_agreement_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b09afb9-d7ba-43e9-a97f-c52537603a00/51725730515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e61cb7-2240-4206-94cf-94a1fc814fd3/fitbit_charge_2_alta_hr_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb356aa1-9681-4a5a-9d27-878eb57855af/xodaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15dea9b-9f7b-4729-9fa1-a6078918d825/muxotib.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/gavibozigepajupirofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddeba7d6-6848-4d35-aebf-280df68aef98/restful_web_services_example_in_java_with_jersey_spring_and_hibernate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3e7beb-7687-43c1-bca4-579a1c61d6a8/zaxemavati.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_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 5332 bytes
SHA-256: 1c9da9108550a6fef9371e8aa34639b9e56dc3899f19a88f0f9158c52533b8eb
font_01_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 10340 bytes
SHA-256: 5229182af8684e837b3e818793d1d8d16f77976e9278c0421a2b6aedb182e854

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