Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cb6fe17f944bff…

MALICIOUS

PDF

93.2 KB Created: 2020-12-27 08:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28520e6aad22de978a90eddeb3fd6d50 SHA-1: dbc082423b4ca32b1059d56200680d7bc78e4ceb SHA-256: f9cb6fe17f944bff357e75c5c65e57ded49319fc2eebe13c3c3656603a95cc2d
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of numerous external links indicates an attempt to redirect the user to potentially harmful websites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=foxit+pdf+reader+for+mac+free
    • https://cdn-cms.f-static.net/uploads/4481825/normal_5fd14b25a888b.pdf
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5f91b09e9f20c.pdf
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fd65c4217d71.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_5fe8208cc55ec.pdf
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/junek-jikur.pdf
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f911ec6ace53.pdf
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/7143201d1ef1ea.pdf
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fa72977c7353.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/zemikujeno.pdf
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fc53e5e29047.pdf
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/7755900.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79e477fa-11af-4f89-a131-b0e3fdb587f9/63463702941.pdf
    • https://uploads.strikinglycdn.com/files/1f8f41e7-4091-4a89-a7a3-e1848ecfd2ef/caderno_com_desenhos_para_colorir_pd.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_off0000e29a.bin
91aeef2270732a81453d327dead8172faa4d534cc393dde285e3ccb6bb8391b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 24344 bytes
font_01_sfnt_off00012d52.bin
c748ca0d66bfb7893b81d4fef8b1090b0e2793b71b7086f41126ca73de0a7119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 5116 bytes
font_02_sfnt_off00013eaf.bin
f3b4b2e41d448f5161132c7beaa46881146fc189812ea6660c06b8967777557f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 11476 bytes

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