Malicious PDF — malware analysis report

Static analysis result for SHA-256 83560b81a95e0b7b…

MALICIOUS

PDF

81.3 KB Created: 2021-01-17 20:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8bae34473c0069fdfa77b5fc09ae105d SHA-1: e772bc8fe12605ff84fe6500d1df7e0118ded2ca SHA-256: 83560b81a95e0b7b1265db658d4aa99b5c9a56a3ff02467541705ed0badd91d8
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious PDF files. The primary link identified, 'https://cctraff.ru/123?utm_term=apartments+for+rent+without+background+checks', suggests a phishing lure related to rental properties. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • 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=apartments+for+rent+without+background+checks In PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fcedc611895f.pdfIn PDF document text
    • https://sejusidanixaj.weebly.com/uploads/1/3/4/3/134374441/lotixuzar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_5fa64f4ed2614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_5fadc9a47dd78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f88247437c78.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/gjgiIT9/97705013926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405443/normal_5fc4f09b32153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5faa508c31186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87a8443520d.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/rlhhhjd/7319649069.pdfIn PDF document text
    • https://femaxina.weebly.com/uploads/1/3/4/8/134886911/5396715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fe22137f2855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fe666002ec06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_5feafea02c75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_5fb9a15146fa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5ff69367dad5a.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_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 5820 bytes
SHA-256: c332585d738cc8ae5c2a595377efdbac24680c7b64caa680f553f6719b1855e0
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10900 bytes
SHA-256: ebba46eb62f30a913e6f61fe3c1b67c2a464e7ab74422df3665dff3cd1646c74

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