Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86e768592ee62cd…

MALICIOUS

PDF

71.4 KB Created: 2021-02-23 18:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3715d7bfc806bc0fea4082deea055069 SHA-1: cff369d6c0f55cd05079342dc188d2b5218ff93a SHA-256: c86e768592ee62cd86c4dc43c4e7134b7177e5ffaf3b7240a983c61e5b101b40
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'jacksth.ru' was extracted, suggesting the document's purpose is to redirect users to a potentially harmful site. The document body contains garbled text, but the presence of the malicious URL is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=bose+companion+2+review+series+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5feb41c78c3c0.pdfIn PDF document text
    • https://zajewovebuvi.weebly.com/uploads/1/3/0/7/130739158/sadufi_fanopurepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_60162e28cd667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ff52d141b450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403824/normal_60028a4821045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fffd39f6c3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_6026fd46ab0cb.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/mezewusadesus_ginape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5fec422aa49c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453551/normal_602ad102d485a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogimutidum.epizy.com/fewawurelekaje.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/73226142361.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/system_requirements_for_adobe_premiere_pro_cc_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/susatafi.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/bcsc_ophthalmology.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 5544 bytes
SHA-256: 0e20606482106916ec86d3eca76f3a89ae3fba68962a62f82d7383d8b9b7071d
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 11264 bytes
SHA-256: 0b5a610f03a158c76469e60e397008b56dbad1c3e839b07b5f60ce5c68397312