Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc28553e92d4b88…

MALICIOUS

PDF

63.1 KB Created: 2020-11-13 17:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcdb2928698ac47fa49ac47b76696d43 SHA-1: 77e68857e6558131a60a809fb99a3628ce9ed563 SHA-256: ebc28553e92d4b884bab124f3f032f76178ba3d147885b5cf17116f28449207b
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic firings indicate the PDF is designed to link to a large number of external PDFs, suggesting a link farm or redirection tactic. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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
  • 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://cctraff.ru/strik?utm_term=de+castellane+brut+champagne+price
    • https://jexenixikejov.weebly.com/uploads/1/3/4/6/134632916/7098650.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fa875eb4c20f.pdf
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5f9d653f70352.pdf
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5f8d50ce4ec27.pdf
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fa2d01866664.pdf
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5fa73a3ac1c23.pdf
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f9fe7ff9ff8f.pdf
    • https://danenogamapan.weebly.com/uploads/1/3/4/4/134481258/6de20db18.pdf
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/e6a98a9a.pdf
    • https://wotuvakarebor.weebly.com/uploads/1/3/4/6/134665633/rotobatuloxan-rujiwepigu-wujit.pdf
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/dezulunuvoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000b64f.bin
dfb993cf9f897e7eb2eeae5bf252882cb430cab0174cb973b9a9b139b361cc17
pdf-font-stream PDF embedded font (sfnt) at offset 0xB64F 5488 bytes
font_01_sfnt_off0000c8cb.bin
e61b430543e46b0f241cb96bdc235aa9a35cffad16f177f180d10798fa061eb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CB 11080 bytes