Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fdf5e285934b46…

MALICIOUS

PDF

71.3 KB Created: 2020-11-18 13:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 20e72655296a9ea7f29c02335b599e3f SHA-1: 13ed5d2697d8767fd314c49671ff9d413cd16ca8 SHA-256: 91fdf5e285934b4677f74ba1fb2e36d059a0c03f29e0ccc9a25654a074b77091
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

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/123?utm_term=wendy%2527s+allergen+menu+bbq+sauce In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5fa236495f944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5fac25e1956d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f98046a5c386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f9dc4304e685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f93d0eb565c7.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/4703932.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/fonekunoroxumat-timupukivapomi-kanuwagikanitu-fatitudefox.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/24c7b594-9c75-4a92-82a1-ef72693c2d77/45212473340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0cb462-0b25-446f-8f4e-23dbe4469d73/diposimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69be8fbe-8bf8-422e-9d91-d83c9e12b113/fevamatipuvupamatoridi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b0d00a-b6c0-4edc-bbbf-95788131e64d/xuluxulitusufewebate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f5435d-bb4a-4dad-ba89-a26600949c09/11258446703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3193ed5-638d-47ce-aaaf-05a3dbd4909f/divakedutotudivufosozom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1c53d0-3447-48f0-91b5-dc0158bbcd4f/fowuzigofawipovapufuk.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 5676 bytes
SHA-256: 162459019704b10579202d121c8deb273597f598b366e447d0198202b653a220
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 11336 bytes
SHA-256: c7f50e0af83117121382b24da2d48c647a9aa3daa966cfe6e3bd3385c011cf8e

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