Malicious PDF — malware analysis report

Static analysis result for SHA-256 2889125e40a6373e…

MALICIOUS

PDF

66.8 KB Created: 2020-11-09 18:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 52f136a1385c1d689445d6bcaeb288be SHA-1: 92bf25d616a0f3c87cf24fc0c52806ed05ab31fb SHA-256: 2889125e40a6373e3c7186435712a36df973add745980cbea5c3b2a538bde607
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically pointing to 'ggtraff.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack pattern involves redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=arctic+ice+forum In PDF document text
    • https://xelabuxu.weebly.com/uploads/1/3/4/2/134235382/1405866.pdfIn PDF document text
    • https://sazimopugis.weebly.com/uploads/1/3/4/6/134611647/waripizuxubemuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f95d22f3ad82.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f9a82e7822c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8a745199906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5f95d4dab9ba7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3095ed5-f324-47af-8317-bc3b4c66a1af/goxizowoxixibafawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f6eaa0-99c5-4109-9335-b76c7cded58e/hotmail_com_sign_in_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fd60a6-c3e7-49f9-8d60-d3c4e9716c23/18721745730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a92e882-7f72-438c-b797-d35189537ce1/lefiwogekakesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9471b695-6d54-45af-b7b0-a9ebb6546c36/temazerefeminatixito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20ad5b2-95d3-4ea5-af63-284b744aed6c/pofujalujofasezev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 4596 bytes
SHA-256: ddab4d06a8712176fd8b7332f7ea36dd374390920911cf3387564604317f60ed
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 11164 bytes
SHA-256: 3d1e0979c9b56edbe575ccc3e69aff668688f8531e0cb9eb10a0abc953611e04