Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f0b97fa79e244f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-03 01:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5f547810ee4d1d1d5567cbda4b8e896a SHA-1: 9b9a85fdda2f89f6269d59b61bcece10649ca6f9 SHA-256: 35f0b97fa79e244f2a4bb884f521fc33dbe91f1f56ad23f6ae4c329843864fbc
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. An external URI pointing to 'nipisod.ru' was extracted, which is likely part of the phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site.

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://nipisod.ru/strik?utm_term=excell+2400+psi+pressure+washer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcf83631a9a6.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/27384944952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_6006078e6f3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_601d324693e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/jcrgcji/90079587974.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/33574546784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5fdae180ce91d.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/purisomedolepopatu.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/87453040176.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/P6ihOja/87353206772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dinisemowoge/83958947161.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/gekasazuvatemebexed.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/rosomewo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/band_mp3_all_songs_for_free.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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 5088 bytes
SHA-256: b734aae7165378be06f74081252b040b80dc8b58b7282a2daec9c4763125b8b0
font_01_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 11532 bytes
SHA-256: 5b2ced838691c388e8e1aecf2f56b87202c24127c392fac6f31147961f20e5fb
font_02_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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