Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b5e00cd4d7f956…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 03:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5ac4efcbb3c068ccf57d52df78cf0447 SHA-1: 98a4db7d2a3e0fe543ec37ac09fb8288e14a8b13 SHA-256: d3b5e00cd4d7f956c17fbe61d7c1080d95986f29fa06ebcaf9f1f84c8f771ba4
184 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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://jottigo.ru/award?keyword=japanese+grammar+textbook+pdf PDF link annotation
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/ca48b99ac82760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_601d286476b30.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/101c0091fd863.pdfIn PDF document text
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/nenex_xajojipunasez_wilaxokoziju_sajufet.pdfIn PDF document text
    • https://firikanafumofud.weebly.com/uploads/1/3/0/9/130969048/wofekotowes_dosuviminumiger_mutamelopew_lulidaruwulo.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/4704938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449605/normal_5ff2b26f26e6e.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/cgjWIjb/begifomi.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/dukivapozo.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/9736051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5fdea898b4b8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gudukupir/jopilofojex.pdfIn 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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 5588 bytes
SHA-256: ebe5e478d7528d14d162f680be3185672b698ac4a565d252805af87cc624dbf6
font_01_sfnt_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 10340 bytes
SHA-256: 2f71fc9172ebba7303eb742e749a61674cc324a4802d7c71718c86868f62d719