Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd7a51779448d85…

MALICIOUS

PDF

73.7 KB Created: 2021-01-28 20:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1c81aa81ba66f1f317b7b79ba4883033 SHA-1: acae7abf39f94d17f962b6e0c43e07860567668f SHA-256: 4dd7a51779448d85af639799b439734f8336cdcb5a24ccc7ea536c820827c6c1
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. An embedded URI points to 'https://leonvi.ru/aws?utm_term=writing+format+in+english', suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/aws?utm_term=writing+format+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496372/normal_600a7f6492f86.pdfIn PDF document text
    • http://ital-girl.space/cummins_6bta_manualzd4qv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_5ffb4622978d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_600bb7b83a7cb.pdfIn PDF document text
    • http://bifitiguz.iblogger.org/secure_vpn_app_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374698/normal_5fdd8bc65bc0e.pdfIn PDF document text
    • http://magic-spring.com/zaxabuxiwavdmsmx.pdfIn PDF document text
    • http://domavera.ru/manual_recliner_armchairlq2fg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5fc63b26a767f.pdfIn PDF document text
    • http://giboxibefelas.22web.org/outbreak_perfected_final_mission_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5fc6d0484af84.pdfIn PDF document text
    • http://lazezubeb.22web.org/58150078529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5ff976f318d57.pdfIn PDF document text
    • http://gifipagi.22web.org/baggs_para_acoustic_di_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_5fdf803dbef2b.pdfIn PDF document text
    • http://boost-shop.xyz/past_present_future_progressive_tense_quizu872v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_6000a5dca0dd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xamudakosenezi.rf.gd/ratuxetixidijumisumezir.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/continents_around_the_world_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/apollo_conventional_fire_alarm_panel_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/mebinagovitib.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/94258059774.pdfIn PDF document text
    • http://pasufok.rf.gd/resignation_letter_acceptance_email_format.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_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 5196 bytes
SHA-256: 261bc6aeaada219f99cd09aca4aa4180e07037177fa520861f996befb9e1ccb2
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10172 bytes
SHA-256: d632b7a3ac2d32471a0357be5c9d20b3ed10b9257c71d1a5bdd7f0afdff8818f

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