Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db553f5c68f673b…

MALICIOUS

PDF

72.6 KB Created: 2020-12-31 22:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 25057d3060078f82d62c5167d06330c0 SHA-1: 2cb3c4335be8d42d37de1502f920a9e1fd43de7a SHA-256: 2db553f5c68f673b442897abf60c338fb466e37e80a905d1259a8d56c3e932c1
162 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/wb?keyword=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C%20stickman%20fight%20the%20game%20mobile', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The embedded URLs and the overall heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/wb?keyword=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C%20stickman%20fight%20the%20game%20mobile In PDF document text
    • https://rugulobasogaje.weebly.com/uploads/1/3/4/7/134770789/jexesafunolosad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f87d14329c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fe40793abafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5fa63c9561629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fd18df1c69f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fcf2202abfeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5fed17b5582f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_5fbc4311c1f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_5fe79bc9a8efe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_5fec1801c3337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5fd9c3856c487.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/xijalovelokolep/12957986943.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/coliformes_totais_e_fecais_definio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/278663cb-7fc8-4894-9728-7f9e9e61ce3d/record_policial_ecuador_con_numero_de_cedula.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_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 5940 bytes
SHA-256: 3d196f2f519fbcd8838f7c51a5f43b54293c2681940be6209b03e06eb606b35c
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 15044 bytes
SHA-256: c68554c187976f47a1f2934aafd2348d251573802f5fa7fad38bb0abb2193228

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