Malicious PDF — malware analysis report

Static analysis result for SHA-256 8804ca3d67eefa5c…

MALICIOUS

PDF

60.2 KB Created: 2020-11-27 10:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f2e6b26e32c4da310a1ad35045d4ab SHA-1: 1cfc39da1307a3b76f41b509dbafc06a6d8b0abc SHA-256: 8804ca3d67eefa5ce090bcb4e29136eea410bb2339ab39a758e47d1f5ef8b094
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or direct users to potentially harmful content. While no scripts were extracted, the PDF structure and link analysis strongly indicate a phishing or SEO manipulation tactic.

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-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://ggtraff.ru/aws?utm_term=best+video+player+android+reddit+2019
    • https://gamaditer.weebly.com/uploads/1/3/4/5/134583337/621534.pdf
    • https://cdn-cms.f-static.net/uploads/4477408/normal_5fbea17d5db92.pdf
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/fujotusosa.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5fa5f4ae98107.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f8fc8e48d6e2.pdf
    • https://xosetumigex.weebly.com/uploads/1/3/4/3/134371377/97114.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_5fbee1438e3ca.pdf
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5fa2cd8cee252.pdf
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5f9dc4e4e97b3.pdf
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5fabf6b076617.pdf
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/kuniwusuxufifikidu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d576f15-9030-41d5-bccd-1f399ec18ae4/nugem.pdf
    • https://uploads.strikinglycdn.com/files/2b5fa57b-e127-4b22-8155-8e69516e5429/likakugebesam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8c5.bin
93ca74ae79a3096450af26882ffd5c7c8d344d772d2ba0e3e22daf6024f8684b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C5 5648 bytes
font_01_sfnt_off0000bc13.bin
32c9735be5e9b7b13cbe74779b6ea8ad6216d713a4d7d56ecf1e0de8bf6a962e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 1820 bytes
font_02_sfnt_off0000c4c6.bin
73d189640a5f5080c535230ec12a27b6c991871324f721e3806c5e6c3977506b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 9008 bytes

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