Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8790b02b465e6b…

MALICIOUS

PDF

68.0 KB Created: 2020-11-16 16:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bfc17b23df5bc403e41f6a53319b1fb SHA-1: 76721fd00f255f47453c3c7a23543dce9eca7bac SHA-256: 7a8790b02b465e6b3dee99a03e93842ba1018a72d11328edd8e68b5df8ef9dd6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/123?utm_term=what+is+mixed+spice+in+australia
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdf
    • https://cdn-cms.f-static.net/uploads/4461763/normal_5fa41cf23a682.pdf
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5fa11dbe57d20.pdf
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fad7e366c5c8.pdf
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f97be0a56ab7.pdf
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/tivugukif_sutedud.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f92597f637c5.pdf
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f902fdd96577.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xapidajovaji/emperor_scorpion_black_light.pdf
    • https://s3.amazonaws.com/wajibile/zemuberad.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_off0000cd88.bin
93bf89dbbb3e803a275a1db91b3286cdbbd8681e78d0c5f2f26ee10fc91d9498
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 5396 bytes
font_01_sfnt_off0000dfc3.bin
650ec6dde0ae920e91e3147e1bad5727eae95b106b7af589bc622be957bdb4a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10644 bytes