Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28ea2387c0925d6…

MALICIOUS

PDF

70.8 KB Created: 2020-11-26 08:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01ee135bccef39a0a346e942de515244 SHA-1: 18991e427917161074d30d84c2b34932683b1269 SHA-256: d28ea2387c0925d6ed87210d35e2fed7d76576423aca2f798068027dfbe548f1
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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-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/123?utm_term=external+hard+drive+black+friday
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f90a25846e7e.pdf
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/tugamax_rezedaloki_dadefemel.pdf
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5f9ea327c4aa8.pdf
    • https://xuvosaxefon.weebly.com/uploads/1/3/4/6/134605895/sovuwunatoz.pdf
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fa227e946a5f.pdf
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/gipedesul_bobevajeru.pdf
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/b704a04786868.pdf
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/bamuralizoxaxetexe.pdf
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/pifopirepelumawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/498ffe09-c088-449d-b2ff-13931402e050/the_birds_story.pdf
    • https://uploads.strikinglycdn.com/files/d695c380-de9d-4e04-814c-0903b2c61a5d/64223287823.pdf
    • https://uploads.strikinglycdn.com/files/8fc12b2b-cfd3-4854-bddb-06cc21964584/corresponding_angles_postulate_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/e5eb3382-b32d-4a92-af74-21b79732203a/nurapibuf.pdf
    • https://uploads.strikinglycdn.com/files/3f3a0a20-32cf-4a17-8197-85696fba6ee7/velupavavokerom.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_off0000d7ac.bin
9b0d607656e13ec7dafed664786665716640f99179d22412572e12fb4defd8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 5324 bytes
font_01_sfnt_off0000e9d2.bin
f68e8d9c9de1aff81efb307e02bf38d65f66d9b227b04a1c02c4c3d50666e0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 10644 bytes

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