Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c0f1c158350cfa…

MALICIOUS

PDF

76.4 KB Created: 2021-02-14 09:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 94d96ecc130d718673c81ba6942e74be SHA-1: e23c547f6becc77de9695373db9cba6a3bfb7e66 SHA-256: 66c0f1c158350cfabb6071534e9ca2b198e3ac134cf6b3ef7c55e59b03714b74
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://baarspo.ru/wix?keyword=vw+502+00+oil+autozone', are suspicious and suggest a lure to a malicious site.

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://baarspo.ru/wix?keyword=vw+502+00+oil+autozone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480876/normal_5fdea5cb22a24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492246/normal_5fcf4459ad4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_60174b9fce21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_601a69142111a.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/iOJRQrn/popasugatatoxavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ff8aaf2b9549.pdfIn PDF document text
    • https://lekibuwowobaveg.weebly.com/uploads/1/3/5/2/135295955/373ac1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_5ff5ad64af6f0.pdfIn PDF document text
    • http://esmoney.site/71951224529dt22q.pdfIn PDF document text
    • https://vovisomesosaza.weebly.com/uploads/1/3/4/4/134462399/d8860b55284785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5fde134943517.pdfIn PDF document text
    • https://rufogeror.weebly.com/uploads/1/3/4/6/134664275/lorumowimavudemarilo.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/bugutaj/nubabidabituxor.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/esophageal_varices_bleeding_guidelines.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_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 4908 bytes
SHA-256: 1ea23dbaae750c65032fe12335cc984180d85ac2c1bbcd0e044f31e5f9aab323
font_01_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 10900 bytes
SHA-256: 2232aaff81bf76605ea78a74d055c161fb0ac73610da5e3d4fc2392ecd3e85df

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