Malicious PDF — malware analysis report

Static analysis result for SHA-256 1400b1b0e468c26f…

MALICIOUS

PDF

90.5 KB Created: 2021-02-24 21:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 87543834ca17598e9b629e2a104c6629 SHA-1: 9ba059fbc16fc4aa17683f064485b57d7fdf000e SHA-256: 1400b1b0e468c26f072bc27c05b4c11bc69461c1de14dfc6119ecfae8925e752
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'jacksth.ru' and a heuristic for a download button lure suggests the document is designed to trick users into downloading a payload. The truncated document body does not provide further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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
  • 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/wix?keyword=thing+explainer+pdf+%25D9%2585%25D8%25AA%25D8%25B1%25D8%25AC%25D9%2585 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fc8552e33590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_5fd636c06c27d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5ff8e843b5586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412588/normal_5fdf08ddc6427.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/64554158297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5fc9a6dfeda76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_5fd6e7633957e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_601d0c0ef3be4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5ff7871fec835.pdfIn PDF document text
    • http://muvibigi.22web.org/25028030381.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/fadupazageraf/9984117824.pdfIn PDF document text
    • http://rafodize.rf.gd/77023074009.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/kaviduwinosegunedizozali.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/wuxowu.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/factorio_strategy_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012cbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CBB 25952 bytes
SHA-256: 7799ca68e891d2595118ff02693ce8c7cd900a1c07a283f6a9dd6f464f87840d
font_00_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 5140 bytes
SHA-256: 1b6b8a5ec60bf88bfdf1a92a97a3eb3dca50a6e96de49380e10555d3af4decd6
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10028 bytes
SHA-256: 0ba20ff86bf2a3f9c1b6fb8249798bd2bc2a9ad9048d59884e52dae38132ed29
font_02_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 16728 bytes
SHA-256: 905adad2461c6882ee60401f53cd95810522f291487c459e6c97767cc7635be1

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