Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4ce16b545464d2…

MALICIOUS

PDF

82.6 KB Created: 2021-02-12 15:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 88f3e42073449a3f68bfac20bed880ad SHA-1: 98665b17a1a155a04be7ef6a397562304ad8f243 SHA-256: 4c4ce16b545464d287164150fd7fe2fb7de3d6875a53aff2e8987c689642cbaa
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL suggests a phishing or malware distribution lure, disguised as a tutorial. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=ansys%20workbench%20tutorial%20for%20beginners%20pdf PDF link annotation
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/nojaw.pdfIn PDF document text
    • http://bestunew.xyz/648279501582gmnn.pdfIn PDF document text
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/3924253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fe78a9779e0d.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/7389207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_600b7113eee25.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/eEhhiem/total_recall_human_shield_gif.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/b2e9149f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470221/normal_5fe0a90d5b26d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5fc94f272c8e0.pdfIn PDF document text
    • http://urolog.xyz/nitujipetzjbb.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/4885396.pdfIn PDF document text
    • http://indital.fun/lafaginokegorosalisaxonef5tsdj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fde69456c9dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_60078ecf0d186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fc85e669da11.pdfIn PDF document text
    • http://sovetnik53.ru/play_tube_for_cats987dv.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/2gjhjhf/towubarebirowufovetadozev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_6023f31927422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 5804 bytes
SHA-256: 013ecaaefc9f8806af002e755004784f4e3d2ae8374a5b3114308bfea437f04e
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 12648 bytes
SHA-256: 35d40e80f32e2a85a1636f78d3b7858353d53e66d14c09a684c6301f6707baf8

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