Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d86f5d52babb4b…

MALICIOUS

PDF

72.1 KB Created: 2021-01-06 12:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9a5e760ee6f4be326f3fb92fd0df91fe SHA-1: 91ad14119a0f608915b292079454ccb437f34b3f SHA-256: 88d86f5d52babb4b1be07d430cafa33103c43b1f3f717f6d633dc490a638e0ba
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt disguised as a resume template. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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?utm_term=resume+template+document In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5fe8a2c38968d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_5fa5e113bc9cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd146cb221cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f89f40d0f087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381547/normal_5fc7c03615dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f871a85d2169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5f9d54f3baedb.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
    • https://uploads.strikinglycdn.com/files/cba32c04-1f06-4bd2-a894-665516e3a149/fewisigejifozolezadutev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12dffe5-fa7a-48e5-a09d-4bf0061b70c5/motenuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93ed467-4ea8-476c-8537-fe0bf8051a5e/mulirikekebopusuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419b8607-bdcd-452c-9809-be17dcffcfc1/xosoroxeduzisida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeac6177-3350-41c4-ad8c-908892368e86/rimetulaboxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0f30ae-bc52-4732-ab22-5c862a9b9987/tipaz.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_off0000d132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD132 4964 bytes
SHA-256: 36b63ef15e6b16f8cdb7491b854c9f1ffc722e5544a3aa4df45b24cd2365b292
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10496 bytes
SHA-256: 39ae92d5dcb2529dc14bd03fd22ad474cb166f3b895fcf81bdedb6f6ae930707
font_02_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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