Malicious PDF — malware analysis report

Static analysis result for SHA-256 b989c9aca8e7087c…

MALICIOUS

PDF

65.4 KB Created: 2020-11-10 05:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea71622be7674a5d778c09789328f2b2 SHA-1: 5e67dc1b83567fe9aa568f5ff8da7165a7908f24 SHA-256: b989c9aca8e7087c0be95efe5186bca8e55479af9a763febf92ccb6ecf4880df
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 one identified as a malicious redirector. This suggests the document is designed to direct users to malicious websites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?keyword=everybody+loves+raymond+episodes+bing
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/fe34ed819a.pdf
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5fa39bf187e04.pdf
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5fa17a1aac73a.pdf
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/bf0768bc9a84a.pdf
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5f9fd0b7eafc7.pdf
    • https://cdn-cms.f-static.net/uploads/4486963/normal_5fa9a3820074a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jamokaroxoj/33499500654.pdf
    • https://s3.amazonaws.com/nigimul/how_to_install_.apk_files_in_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/6424a122-f8b6-450f-bbf3-a68e5bc10848/96380954200.pdf
    • https://uploads.strikinglycdn.com/files/bdf82bf5-7ab8-4e48-ad05-f9d8bb85a0a7/87440631886.pdf
    • https://uploads.strikinglycdn.com/files/f0328246-9c90-4a79-b707-80cf2859199b/gujenosupufebenixovoto.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_off0000c388.bin
cbea5cca66500b244e701d9c3ee35523bfc997dae0b05c37a5d381654695b375
pdf-font-stream PDF embedded font (sfnt) at offset 0xC388 5536 bytes
font_01_sfnt_off0000d654.bin
73ccbe06536549e0e3a4f2e16479df963f51e54cba0d8a669927ea288c3cee28
pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 10264 bytes