Malicious PDF — malware analysis report

Static analysis result for SHA-256 4130d94758685f00…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 16:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b14601226446ab2a854f74820023320 SHA-1: 59616793f8b2ea885b01c01a9c7c56df8023fc6e SHA-256: 4130d94758685f00057ac8b439a0f4c920b3adb72c7ee18cf49f4d0da8ea884f
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with a significant number of external links pointing to potentially malicious or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=how+stuff+works+internal+combustion+engine
    • http://faxozulakevosos.iblogger.org/anari_1993_3gp_movie.pdf
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5ffcc1939a6c0.pdf
    • http://barajofa.mywebcommunity.org/46594271883.pdf
    • https://cdn-cms.f-static.net/uploads/4469850/normal_60353460388c4.pdf
    • http://kononameve.mywebcommunity.org/priere_tres_puissante_pour_attirer_l_argent.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://manutilo.epizy.com/47959085063.pdf
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_da8d9a3429d84c1d8ea0857596a5d516.pdf?index=true
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_c0a186af43414acaaa14dd618df637bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f8f89d5-84af-4e46-86db-b69c2bbe29fa/thermador_wall_oven_user_manual.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_5a9784f7124543fe86f93b7543d26e4b.pdf?index=true
    • http://sajulugebimisu.myartsonline.com/wufirazewilotirupuf.pdf
    • https://uploads.strikinglycdn.com/files/97ba33d4-bad0-42ee-a2c1-68d27a695efa/high_heel_platform_boots_size_4.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_82922bce07824fe4833f0628220b923d.pdf?index=true
    • http://pavejovubebus.rf.gd/26696499629.pdf
    • http://daxojit.epizy.com/habitual_buying_behavior.pdf
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_c0a6c0f035874940af024e5a48f95bee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/736c6310-0e79-41bd-92c5-edb502ad542b/roland_td30_kv_for_sale.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_43b5e4aa9aaf485885241132937de860.pdf?index=true
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_3954bf791b8b4174871c4d65884d061b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9a8e4080-7cec-4328-91ec-1fb9a814de1c/22455807723.pdf
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_a9b2bf59559e43ec9210cb8766c1d163.pdf?index=true
    • http://vebegab.rf.gd/windows_10_update_2019.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_off0000e59f.bin
d6845f7bb357bc45ea28659d6ab3eb9c7e31a2e10385e8703a809331bb3be836		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5456 bytes
font_01_sfnt_off0000f831.bin
183441f7e4ce3b2acc69c2442e5da728f7e49c39b02747209d1bc510f334e9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10184 bytes

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