Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c031783e413a45…

MALICIOUS

PDF

67.2 KB Created: 2020-11-11 05:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ac644558fccda385a536ba964737ee18 SHA-1: d40f9a2992ab60c14e5ec8ca734c44d5578fb967 SHA-256: 95c031783e413a458d841be3b3ec7f053e59d634b532bea4b84d9cde9f4177b6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, functioning as a link farm. One of the embedded URLs, https://cctraff.ru/aws?keyword=lesser+demons+in+runescape, is known to point to malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=lesser+demons+in+runescape In PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/rozipovuvelipifi.pdfIn PDF document text
    • https://jogapemufa.weebly.com/uploads/1/3/4/4/134492880/gonokigoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f8c6342ae27d.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/jozukavofuwokine.pdfIn PDF document text
    • https://guzejanum.weebly.com/uploads/1/3/4/6/134681017/1b0826.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/maradu-kigakekitufazux-dutuvumomed.pdfIn PDF document text
    • https://vovufopoxin.weebly.com/uploads/1/3/4/4/134466437/relosodulezesitid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f8c3ed7dac74.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/0cdaf408-0b94-4be3-87d8-6a717f7b303c/formato_certificado_medico_prenupcial_estado_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92290ca7-0207-4bd6-9038-dd645091d3ca/2106395496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee24611f-0b9d-4330-8ade-fc34e0caa2f7/46194048620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a894a9b9-69a8-43dc-928b-6f3cbccc4853/vadojinemokizeragavida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64425c53-df35-4711-9b83-555381eac853/rodotanisil.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/kopowomapezelevu.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_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 5128 bytes
SHA-256: 594ef8f8fd453396a742309a768a53b965e2a4d1a72fbbfb2c200c41bfbd31c9
font_01_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 10468 bytes
SHA-256: 745b5c60e494861b0b46eb6042679596755a8a59381ae6d173a6573b2335d76e

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