Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27452d13389ac16…

MALICIOUS

PDF

80.1 KB Created: 2020-11-23 05:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a94308ca1602cbafba05fb457e62aba SHA-1: d6a7f347f0ab946fa497b57e57bbdfa615fc84b7 SHA-256: e27452d13389ac16ab8e90ec53cd00c07990ccd05a5561e60dd192d81c433c10
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 a tactic to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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-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://ggtraff.ru/123?utm_term=reconstruction+plans+of+lincoln+and+johnson
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5f91c32ec8cd6.pdf
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f8a198554522.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f89ec7e3d887.pdf
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/feruvapiton.pdf
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fa14d6c67d5e.pdf
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdf
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/2554792.pdf
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fb40097cd326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f59c24ef-b493-4b37-9a79-7f1df67ddcd0/a_dictionary_of_color_combinations_japanese.pdf
    • https://s3.amazonaws.com/kavitokolezub/jalajozifezonosuk.pdf
    • https://s3.amazonaws.com/nopomewegobij/boriska_kipriyanovich_2020.pdf
    • https://uploads.strikinglycdn.com/files/11d5b031-1347-4ae8-a3d6-7f299c205de3/74680142809.pdf
    • https://s3.amazonaws.com/jamokaroxoj/subtracting_fractions_with_different_denominators_worksheet.pdf
    • https://s3.amazonaws.com/pesetufavo/file_organizer_app_apk.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_off0000ff2b.bin
b709607a4c085ae55ed828c3ac23912081e84ddd4065fede52758492d138549b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 5328 bytes
font_01_sfnt_off0001114c.bin
9e0d8727399ae5f879e610de9b47ea7711f54c90e2aa29c216d129d240e9bac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 9884 bytes

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