Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda0221118280e69…

MALICIOUS

PDF

81.3 KB Created: 2020-12-16 21:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: abc9123e7eeef1d8096327c4e43e41f6 SHA-1: 7adee730e25efbe490af44ccaaa5203ccc5ff15a SHA-256: cda0221118280e698e60bca918e710b3751d9a654bda03a4285996205fe5812d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or link farms. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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=andres+carne+de+res In PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/7801030.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/4107629.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/nusuzex-ninogexadiz-dalivesowewovi-xodofafuve.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/bipezopisekimijidi.pdfIn PDF document text
    • https://zoxusikajikad.weebly.com/uploads/1/3/4/8/134851315/5941716.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/a081f94c8d0f.pdfIn PDF document text
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/991110b.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/widofafane/73996631143.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/93092269698.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5c469ee0f32b874b2388/1606376536785/cobalt_hammer_tinkers_construct.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/98770954599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aef6990-4e81-46b6-8c7b-f322fd87d938/6th_grade_worksheets_on_ancient_greece.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92805c5-e3fc-4f08-b943-ccc1837bb46e/3394091603.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c362403f5353fd950a5e/t/5fc1d0e71972c46e3ce17d7c/1606537448719/zixuvivo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e3e02e34347c705dd75d/t/5fcba2601415195da0898969/1607180902242/vudasumebokunot.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/94864495203.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_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 4888 bytes
SHA-256: 2a3c2349393b0033d79c5dc0aa6c17f41b348a1b42a7e9877038458983aa960d
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 11824 bytes
SHA-256: 69a08f6462abd8fd779e5aae3ccc53b7c87a8b4ced54752c238afb344631b11f

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