Malicious PDF — malware analysis report

Static analysis result for SHA-256 571e6f139692feb0…

MALICIOUS

PDF

354.8 KB Created: 2021-05-19 06:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 74906553263c148145c8adb7f0d41ad3 SHA-1: b29dcdf3bddb0b37de96ed4e925ab5b7c9c9cf21 SHA-256: 571e6f139692feb05107d03c058898c41ccf000348d4ba3dbc3cde1ca08edfcc
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'ro antiscalant chemical' and metadata indicating it was generated by wkhtmltopdf. A key finding is the embedded URL pointing to 'vilenefex.ru', which is likely used to host a malicious payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://vilenefex.ru/strik?utm_term=what+is+ro+antiscalant+chemical PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fe4483007240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_606005a219c65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370063/normal_5ff0088c65a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_602468d3c8ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6025ce648bb02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_605417a934f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd9687f67ca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458615/normal_605f91ebb2457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_6023d8d8243f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5ffc946823021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_606ad2e1235f1.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/gedimuta/who_invented_mathematics_first_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/8363768226.pdfIn PDF document text
    • http://kanabikovokes.epizy.com/consciousness_in_advaita_vedanta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fde0c98-1652-4dfe-9422-179d66714f48/rezidasogotodowa.pdfIn PDF document text
    • http://xogomegutu.epizy.com/beautiful_creatures_2_book.pdfIn PDF document text
    • http://fazafof.rf.gd/informal_separation_agreement_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1afc489-9c4c-4037-9baf-ff089e34f6e9/where_to_buy_jason_vitamin_e_cream.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_off00054256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54256 5052 bytes
SHA-256: 4cf4f66f12d0a90ffe7e0521a4a6804f915797bc2ae13e34eef4fe405184385f
font_01_sfnt_off00055364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55364 12612 bytes
SHA-256: f8d9092f0957e1331d0e7ee9617f4de4268c1543fb84ecbcae9c98aaa889fc8b

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