Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbb98b09425b97f…

MALICIOUS

PDF

82.4 KB Created: 2020-12-26 01:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d1572c3a328f5b06b963db502a78725c SHA-1: effa3a092dec3ec5866fa48240e3c7fd1cceb886 SHA-256: fbbb98b09425b97fb07c0819f40b28f953804d60141c357b1af03ba25b7646b4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, characteristic of a link farm. One of these links, 'https://traffine.ru/123?utm_term=mass+effect+sovereign+quotes', is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites.

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://traffine.ru/123?utm_term=mass+effect+sovereign+quotes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f9074889ecbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5fa0a1d434b3a.pdfIn PDF document text
    • https://dijatetobof.weebly.com/uploads/1/3/4/3/134322453/8842748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5fb29aacd2dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5f9e94d794029.pdfIn PDF document text
    • https://naxejewosusubet.weebly.com/uploads/1/3/4/7/134749601/990136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fcbc402a5434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fd3036c0dfa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_5fa40470468da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f9535b7d196f.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/4252045.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/2261ea84a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5fb2a049c9d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f8f54a3844df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5fac062eaf9fa.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/a62747b3-7302-4469-aa10-93c2437cb001/33395176902.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_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 5208 bytes
SHA-256: 65a97dd4226b33879e0cfabfbc2eabab19026ba30fd67463e48625eff12fcebb
font_01_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 10696 bytes
SHA-256: 8d0712577120f6e54a4d18e89dc892c5eadcbbbe95fe7b9833a4fb2985f2a09d

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