Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bc54774ece057f…

MALICIOUS

PDF

82.8 KB Created: 2020-12-25 20:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 595f1fa05f591cd5adf77ea530363823 SHA-1: 679ff456b13c03e3f7ac2b69b735a8c5774f37af SHA-256: c4bc54774ece057f711b0a8edf16c8361d8b238075c39358de4ee9c79b38922f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure strongly suggest an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?utm_term=reporting+results+in+qualitative+research
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5fc5425d663b9.pdf
    • https://cdn-cms.f-static.net/uploads/4452593/normal_5fb01e254e80c.pdf
    • https://cdn-cms.f-static.net/uploads/4449411/normal_5fa7412e6710c.pdf
    • https://cdn-cms.f-static.net/uploads/4489052/normal_5fb2f359e1ccb.pdf
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/82e018af.pdf
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/2b21fc632e9b.pdf
    • https://static.s123-cdn-static.com/uploads/4379241/normal_5fe05064ddb39.pdf
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5fd9bb1b72717.pdf
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5f947af0d802b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e0b3a92-4fa8-4d27-86e2-2eb4f1c83406/cuentas_de_activo_y_pasivo_y_capital.pdf
    • https://uploads.strikinglycdn.com/files/9e94a1ea-8100-41db-99ed-9e8dbea46d4b/palepobinanopavexugunox.pdf
    • https://uploads.strikinglycdn.com/files/77ad3f5a-0ed4-413d-89e9-9a1914e4cd23/82869838945.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b7.bin
534dc6a0dabe9d525078df3b030797fdfb3213c898422b1b91c7f4fb51223dcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 5388 bytes
font_01_sfnt_off00011a19.bin
f1633a5ce7234ad282f1be93e0fe6a4f41cd8d54868cb0209205f9dcbe4b9cc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 10540 bytes