Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd0ebf766a6ff21…

MALICIOUS

PDF

71.9 KB Created: 2020-12-19 15:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f6943e73318c87da3a2c1bffe876d4ab SHA-1: b80c4c7b26dcaf37ae027bbed8b8ad3e2757bb68 SHA-256: 5fd0ebf766a6ff2112f773927eed0b70b5c5a51230b9ae831b21a2e20df7aecf
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'traffine.ru'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, with one pointing to a benign S3 bucket but others likely serving a similar malicious purpose. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely used as a phishing or malware distribution lure.

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=nigerian+meat+pie+cutter In PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/15bb762e86b.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/sogog.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/rekawexuretowo/excel_bedingte_formatierung_wenn_datum_zwischen.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/angular_bootstrap_template_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/hernia_hiatal_deslizante.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10afc403f5353fd968892/t/5fc3fa0c4e98326c028c7cca/1606679053120/free_cookie_coloring_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14963acd-f5b9-4d75-8bdc-0a31d68bd208/4226097184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b0247d-48b8-4f6a-bb88-3c538d82518c/19855842943.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcacb310a8fb02f5d5db8a/t/5fdcfd6ebb9a4258a62b9bf8/1608318321050/45286889314.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/39868400252.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/management_of_cauda_equina_syndrome.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0eb7bc819f1cf4a01751/1606291128259/el_escudero_de_dios_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/adding_ed_to_cvc_words_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/allen_jaipur_asat_online_registration_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 5012 bytes
SHA-256: 4b35e99b69b5bec9360d96a35679ece60297089e39e79aba8c4a3be0c7268c00
font_01_sfnt_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 10576 bytes
SHA-256: 54479f2e486914d77cb0c7731d06ca0ac1a4a4bf9c7e419ed408084c9e8efcf9

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