Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d045e13f0a0113…

MALICIOUS

PDF

78.5 KB Created: 2021-04-03 06:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6565b298413ebfcd140cd2187de53b7 SHA-1: 1a167e52f1965e6f5741d132f8eefb809b5e4b77 SHA-256: 90d045e13f0a0113236048066b615ec51a08aec184103556fa68b925808ef664
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://golowaki.ru/123?utm_term=ccna+1+answers+chapter+11
    • https://cdn.sqhk.co/duponetix/2iawSgZ/47293211289.pdf
    • https://cdn.sqhk.co/kakovavop/ijihbhh/54447003153.pdf
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/gunodokekepor.pdf
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/serusulixew-pitor.pdf
    • https://cdn.sqhk.co/jabuvilir/hgdeXss/color_splash_elephant_tattoo.pdf
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/6506963.pdf
    • https://cdn.sqhk.co/kebokeregim/jehiTgd/ghostrunner_review_xbox.pdf
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/4414135.pdf
    • https://cdn.sqhk.co/tobamozusaj/HzAhfjh/jujigat.pdf
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/701137.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_1759c1a52dbe460b9644fb0cd680de2d.pdf?index=true
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_2281ad5b64d24d6e8349fc8faa6c716b.pdf?index=true
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_11af8c2c71b3454bae291f265895ab8d.pdf?index=true
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_bf23f7cb5b554cf6b074e4c0ebfc1e67.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_e15c53c3e3a944d0afaca9283d9f923d.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_781a2aaa34c04066b0e8c6c2edf203ae.pdf?index=true
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_1bcbadb1267a49089683391a99c60f0a.pdf?index=true
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_13336103b934437ebc3ff3e7966b803f.pdf?index=true
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_7f99c8d453af4b7484ab83b8970e30dd.pdf?index=true
    • 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_off0000f8c3.bin
083192d4bf0a09387a71f962e7e8b6e196aa3e6daae87a4017ab171659d59140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 5036 bytes
font_01_sfnt_off000109f7.bin
8d31987a7c08acda59e906f575707171c2b1eb5808c0075d4ee4ac80518f8de7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 10252 bytes

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