Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecaf44daf52fbf4…

MALICIOUS

PDF

70.8 KB Created: 2021-02-19 08:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9f348580181ffa50796901fec7e3be9b SHA-1: 52c7d2d1032f0b5fc6512f4d30c5d2aafc4bb8fb SHA-256: 7ecaf44daf52fbf4ca86502094673bab3e837d7a7269d026c3909a676a702df6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wb?keyword=john%20deere%20z425%20problems'. The ML classifier and ClamAV also flagged this PDF as malicious. While no scripts were extracted, the embedded URL and the nature of the heuristics strongly suggest a phishing attempt designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wb?keyword=john%20deere%20z425%20problems In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_6029ccb38a402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fc8d14b41d33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_60283f1dc5854.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_6003268826947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_60276c8cd5132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5fed4619a1cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_601901e028549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_60129a2870211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_600b36051d279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60112b4bca533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_600b38c1457d6.pdfIn PDF document text
    • http://bajuzupur.22web.org/somelaxakedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5ff363ba22aa7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riwugenesujo.epizy.com/9976358013.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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 5512 bytes
SHA-256: 2d353eaeffc01a3c90ca2e00a8e0bae47c302e644fd920099a23389a3b978b01
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10900 bytes
SHA-256: 52f00b055c2871ee5784f6b3732267f46a024c9ea55e545cf18a885c9587704a

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