Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e656c75d4cedc04…

MALICIOUS

PDF

61.2 KB Created: 2020-11-09 23:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 39f9d32c8ddf0a0bb240ed94eabd4687 SHA-1: d77e4758acfcf8e82825fb2f86a71747604d220c SHA-256: 3e656c75d4cedc04445f72ad5283c89756e1b1839e060c46476cf9618d58d913
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or redirector strategy. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded links point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?keyword=immigration+push+pull+factors+worksheet In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f87fb32402de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5f96b81721924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f9f92dd806d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5f9600e980b8a.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/sugaguxagu/jebimefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce58c45-033c-42dc-8fef-e2ab817249fe/delivery_driver_uniforms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3ed01b-e2f0-4f4d-824f-aaf6718b9c7f/xetiliwatokonorifaja.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/jijifu.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/comprar_carros_usados_olx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34785a2-d874-4ffe-bd7e-94bf576d6886/46527411082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275106bf-2b77-4fb1-b4b6-b1caf19f6ad3/avera_cradle_roll_sioux_falls_sd.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 5524 bytes
SHA-256: 666e127a04f652dfddd1b1aa412126d8c6e018874a6dbb06c5926ef15488b933
font_01_sfnt_off0000c5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D3 10616 bytes
SHA-256: 197a66df4ebc72884a720b14340c966c84588d9a2c34993ebb3d2422e7841f76

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