Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6d71bbf7de8e1a…

MALICIOUS

PDF

71.1 KB Created: 2020-12-27 12:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 313f2b79c2e0f42e8e647db5f530e1ce SHA-1: ee4b4c93f893e1ccdb93f609c2921a3148f08ddd SHA-256: 5c6d71bbf7de8e1aa5d72a7b2327b652225424aee9993f5650c3c8699d85b231
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs and the nature of the link farm point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?utm_term=dichiarazione+di+conformit%25C3%25A0+auto+usate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5f91c0f53a23a.pdfIn PDF document text
    • https://jenititufevi.weebly.com/uploads/1/3/4/5/134595561/mijutajuz-nuritiva.pdfIn PDF document text
    • https://vesemidibokopiz.weebly.com/uploads/1/3/4/8/134869856/welosubipa-gakuzi-ragubezewoje.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/zikapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fc880f9bc49c.pdfIn PDF document text
    • https://kibejopabut.weebly.com/uploads/1/3/4/8/134884539/vuxikovidoreku-lovitawaga.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/2693789.pdfIn PDF document text
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/90048e6b3c.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/f95b5633-6dad-4ad1-aa7b-05553d9c3af9/81122084234.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/appear_in_ghost_form_5_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2610bb4-69c9-4dbc-91a8-019b0b1cee42/58948825542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d606b70a-accd-447e-9fb9-6729a2b9101e/26169612830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97f9065-3c53-44a2-8d20-979d22e2ac51/the_fun_they_had_summary_in_malayalam.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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 5512 bytes
SHA-256: cdb92548a186464731e10111ad28025304dabc7656570825e802e29f34efcc4a
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 11340 bytes
SHA-256: 14d7f773c5bbc397c5aaae2497b52ccbbeb25626e0378e9788ae3c17ae471ed0

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