Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b92ed38048ff1b…

MALICIOUS

PDF

59.5 KB Created: 2020-11-28 02:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 94f3b351436b433d73404421c2d9cf99 SHA-1: af4cc11ece51883ad9a1848f387e5c39548a50c9 SHA-256: a3b92ed38048ff1b7ad41511795cf697e2f5c7e323ec52c4351cfde051a3cc37
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, including a known malicious redirector. The heuristic firings indicate it is a malicious redirector and part of a link farm, suggesting an attempt to drive traffic to malicious sites. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=tulsa+county+treasurer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8a2bd85915c.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/ca311b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5f9a83e835cc8.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/lefijugutofata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_5fc084bdcfda1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5faeffe0a945e.pdfIn PDF document text
    • https://saxuvoxu.weebly.com/uploads/1/3/4/3/134319352/048570b4f9d.pdfIn PDF document text
    • https://lomedalepa.weebly.com/uploads/1/3/4/4/134438906/lukijevup_luvew_mofinetarinimiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fbf3fc3b9954.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/48b60421ef6.pdfIn PDF document text
    • https://sosuwijanifoval.weebly.com/uploads/1/3/4/5/134515130/1521153.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_off0000aee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE1 4844 bytes
SHA-256: 9d0bb2b0836eed5ac817cb9d4eee9181843ffaf8712fb62b581718ccfe2de7fa
font_01_sfnt_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 9948 bytes
SHA-256: 246eaa980c32f164652b8ac1b74c92f924facfb2794e39d9658ed872c1b7432e

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