Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c95dea4b64a244…

MALICIOUS

PDF

77.3 KB Created: 2020-11-18 12:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c1cbeff407a9b6e3545eea8ded414357 SHA-1: d6fc01d1b51cf2fe8e81690f2c155f3f80b6d8ab SHA-256: 55c95dea4b64a24422edd7465582ab67d057caca2b59604e362c4fb6a64c9e02
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, with a high risk score. It contains an embedded URI pointing to 'trafficel.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to downloading a PDF, aligning with a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=practically+speaking+rothwell+2nd+edition+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5f8a59f24cd28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_5fb382085e7ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_5fb02d768acc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5fa61de24fe2c.pdfIn PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/punoviwutikiket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5fa44cfdc4e90.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/nowokil/12317626068.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/14396615634.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/standard_costing_in_management_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/79490326868.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/fefobefinowokamifoxixi.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/fikikezetefukubegosemik.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/92102523296.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC7 14344 bytes
SHA-256: 30edf0071e76ff3dfd6d20b3e8694538d4710b7f966de406d9c149073fcadb06
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 5808 bytes
SHA-256: 85a7f4ab9a480a364db998649e23c11a7aeba4619bc391996206921b5bc88ee2
font_02_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 11504 bytes
SHA-256: 17eaff497b2e0ab1c20a7f7873b9b20c0adbdadd378ee32e5fda24776801d141