Malicious PDF — malware analysis report

Static analysis result for SHA-256 66342ab1937b9ea6…

MALICIOUS

PDF

80.6 KB Created: 2021-01-13 21:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 168bf5f6d369aaca36eedaadbd2dfd7d SHA-1: 7512d92274d2fbb8df1f7264f166f49fbfb4474f SHA-256: 66342ab1937b9ea628b24ce002f265738ca96fb34979630d7973c555a4897520
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 directing users to 'gettraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://gettraff.ru/123?utm_term=eastern+counties+league+standings In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fbb217d2fbba.pdfIn PDF document text
    • https://site-1171584.mozfiles.com/files/1171584/aliexpress_reviews_on_hair.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456143/normal_5ffb7894c30d2.pdfIn PDF document text
    • https://rimejosokodux.weebly.com/uploads/1/3/4/6/134691074/vumoti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412891/normal_5ff117cad82f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f8cb3017bcdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418192/normal_5ff8554b5d9e6.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/ic0jbNi/kaporixusumarawosaz.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/gebafis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5f985c36b1ff5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5ffdacb537bc4.pdfIn PDF document text
    • https://site-1178726.mozfiles.com/files/1178726/my_piano_phone_app.pdfIn PDF document text
    • https://site-1208413.mozfiles.com/files/1208413/xufile.pdfIn PDF document text
    • https://site-1168191.mozfiles.com/files/1168191/is_ivan_the_gorilla_still_alive_today.pdfIn PDF document text
    • https://site-1176438.mozfiles.com/files/1176438/35475022276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 4948 bytes
SHA-256: 6c1e0e6ef4c5321e0cc77972c33799c54efd5e23ee384db2878b23056df838ba
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 11676 bytes
SHA-256: 38b8db791ed4a3c9f63cb810360e63134b69fae0a54cf4456de2fe45a8e03b7c
font_02_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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