Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba66c13085fb38a…

MALICIOUS

PDF

72.4 KB Created: 2020-12-15 09:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: da8f046a868d66b38cf987b237811f1f SHA-1: 2d90a5cca4ec03482f81fac128075258097d1d5c SHA-256: 4ba66c13085fb38a89591e45d7d81ebfe05b6338a19a295a3312a42fb86f978b
214 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to malicious redirector infrastructure and is flagged by ML classifiers and ClamAV as malicious. The embedded URL `https://cctraff.ru/strik?utm_term=2020+budget+planner+excel` is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the PDF structure and linked URL strongly suggest a malicious phishing or downloader 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://cctraff.ru/strik?utm_term=2020+budget+planner+excel In PDF document text
    • https://ponamuti.weebly.com/uploads/1/3/4/5/134513888/98daaee09d.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/6194448.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/zofodewif_bepubelos_filemeg.pdfIn PDF document text
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/45436e2a5cd0ac.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/2c6cdb88-f04f-4a4b-9a85-3fea409bd867/wejiwepusigeta.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/advanced_microsoft_excel_tutorial.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5249fd49dd124474fcf6a/t/5fc7f767dd0d500205be141c/1606940523829/zogubobuvojutuvipoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/kibetelaguxojajuxuwimik.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf675b645712565433286c/1606379356855/homestretch_sweepstakes_kentucky_derby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1c7db3-ae5d-43eb-a347-0dcae2b89ea5/libro_geografia_1_secundaria_editorial_castillo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53be8ab79f442f245f56c/t/5fd6902d96ed101a3e47edfc/1607897133982/43467735590.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc789945426f52a30df8d2d/t/5fcab2509c4e6e5b1e0d6f88/1607119441310/90213313208.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cdab3398ff75152d912c/t/5fc41a51f81c9a2a0c22f0be/1606687313475/verbs_that_start_with_h.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 5452 bytes
SHA-256: ee783cc3ee3db4a86dec44680da398768c59cb5793b57d03b31de9b63e38e1a7
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 11404 bytes
SHA-256: 1af35a3065467d6482e484ef6100bbc7b82e85a93642b06a3dcd57f7c58264e1

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