Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a35d1b5bcd7c420…

MALICIOUS

PDF

70.5 KB Created: 2020-11-24 21:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8bae8b70b3d7468242d753ebe12e8eca SHA-1: 9066f12ed082fa1da945b6b4f759c8311013ff13 SHA-256: 6a35d1b5bcd7c42048472c00db2e2975ad1dc8a038442c0187dc56f3d9ff053e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a phishing or traffic-generation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=bootstrap+carousel+slider+responsive+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f89f959ce442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_5fb5b58888a99.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/famexuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_5fb5caf0aa3f8.pdfIn PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/1596902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5f9c023bc90fd.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/komorid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fad638b41bfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ffc345-4aba-430e-b7d1-85b6eb34897e/84796514805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1910c82c-021d-4d43-a606-35eb36476366/paw_patrol_skye_toys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c5890-421f-4754-a3b6-7e1ccc88fd7f/36207345784.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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 5328 bytes
SHA-256: 8dba1ab1f6b410accc2307910adfcc30df43f4ff923317abd02cb4f01c3b1c7e
font_01_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 9940 bytes
SHA-256: 816dc556d1cf2a5aab4ab85b1c52094a2fbd1bc9f53cb857812f2c5594d581ee

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