Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4fffbbae947b10…

MALICIOUS

PDF

72.4 KB Created: 2020-12-23 18:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7e22704c7480b6327cdfdb81a08ebf85 SHA-1: 16ad25ddd0d5cb47f54bc37c8a7500a50b724f6c SHA-256: dc4fffbbae947b103921f930b22d3f4741ec648556f1a881c7169f32ce8137d3
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on potentially untrusted domains. The document body is heavily obfuscated, but the presence of embedded URLs and the critical heuristic strongly suggest a phishing or malware distribution attempt.

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
  • 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://ggtraff.ru/123?utm_term=we+never+close+in+new+orleans+east In PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5fe18a51b2ac6.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/69ea222c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f907b3b424b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5fa592e34cc90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5fae2793b2f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5fb7160e85a49.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/edaa08d.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/wavumavud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f9ac7f85c8cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lupebesu/fesotupuf.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/seselozunejapefon.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/automotive_industry_standards_india.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/25570914267.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_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 4956 bytes
SHA-256: f7d6d7d0120546bb0dc6b55ef3654b2e17ef5dfbb2716ddda8243b14d092c0f1
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10916 bytes
SHA-256: 4735008f0d46535982e49c485de5f34c30224d7e5ca87a62cd9df546b63d028b

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