Malicious PDF — malware analysis report

Static analysis result for SHA-256 51da4cd22b5ca51a…

MALICIOUS

PDF

66.5 KB Created: 2021-04-12 05:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f9551d595b766278338637cec7abab7f SHA-1: 2581c9d6d16210b0cddf3c3b04bf7b50c2d6937d SHA-256: 51da4cd22b5ca51ac342f0667e3b6431956f2ad392f4443a9ee4dea9a48efc54
154 Risk Score

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 or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded malicious URL point towards a phishing lure, likely designed to download a second-stage payload.

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://dafemum.ru/strik?utm_term=motorola+xts+5000+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_60493053ecc2b.pdfIn PDF document text
    • https://cdn.sqhk.co/gulezepu/0Iiejaq/2006420857.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_600ba8890a2eb.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/28155838139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60225424a9bc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482853/normal_5fc6a5b513281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_5fe6777160856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6050b588b855c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5fee7cb53c222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406785/normal_6008b89c254d8.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/hgctjfs/2141763839.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/effective_awk_programming_4th.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_604e808c4317d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5ffc2ace8a471.pdfIn PDF document text
    • http://desokore.medianewsonline.com/fuxaxogijolutejexan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_600dfea51e75f.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/55e77889-c61b-47bc-a608-84ed461aa3b8/sogusimenekikat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f2e98f-0523-4e37-a364-69c25f2f02fc/76803734211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb45b7d-0a09-4f37-9821-e54cbcd76c96/the_secret_movie_2020_soundtrack.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_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 5172 bytes
SHA-256: d9ae7734f115b6708499225bac4c4ba68058181276ed71f4bdb6b694cbe28fa9
font_01_sfnt_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 10556 bytes
SHA-256: 8368fbad40852dfb1e6aa53ca22df4fcdb2746237f23a7ad147e3ad5c6422463

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