Malicious PDF — malware analysis report

Static analysis result for SHA-256 be51a51c3b0ec9c9…

MALICIOUS

PDF

79.7 KB Created: 2021-02-13 04:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7b2afd374f58c29e5e8690cb864bacc8 SHA-1: 1d97a1a64e1be0a59d53d7566bb1ef117a6a6bec SHA-256: be51a51c3b0ec9c942163c5b9a2ad4af4bebea33f6111cc862517b41adc810b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URLs, such as https://jacksth.ru/wix?keyword=persuasive+essay+writing+5th+grade, suggest a lure to external content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful sites.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=persuasive+essay+writing+5th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490273/normal_601caf30d79b2.pdfIn PDF document text
    • https://zatitudebijozi.weebly.com/uploads/1/3/4/4/134460539/waziwalusoval-tegatojokeduna.pdfIn PDF document text
    • https://kilexudu.weebly.com/uploads/1/3/5/3/135347894/leboxadotoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_601aeafe65b94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_5fcc71498ca92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462736/normal_5feebb14b7c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_5feaf169f33b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411273/normal_5fc5d22d7eb6e.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/zugemipugikig-nunalomiran-kigirat-nuranog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454984/normal_5ffcb4cbc7b73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_60156c613df93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387931/normal_6007574c6086a.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/eihjghd/lerujazovagofi.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/jatupinur.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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 5436 bytes
SHA-256: 9c0ba5f31bbbf05682385428e1c4ba8c823504051f4df839040f491bb35b18dc
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 9936 bytes
SHA-256: 57520fd7cb8344b4128de91a63fd0cc7730fee204e445d0e4e2d9a09cad9455e

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