Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38af6d2b419024b…

MALICIOUS

PDF

74.2 KB Created: 2021-03-17 01:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8642b77001f72f006d14b46200ee3ca8 SHA-1: 7aa44cfbbeb15cef1a638f717d3c78381337c937 SHA-256: e38af6d2b419024b7cb28eab4dbbaf14400140713e1531ff7404aac13bbfa729
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV detection as a phishing trojan. The primary attack vector appears to be a link farm, with numerous external PDF links embedded within the document, likely to manipulate search engine results or host further malicious content. One of the embedded URLs, https://kuzutuzo.ru/wix?keyword=lic+all+in_one_apk_free_download, is particularly suspicious and likely serves as a lure for users seeking software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=lic+all+in+one+apk+free+download
    • https://tazumeter.weebly.com/uploads/1/3/1/4/131438167/8078743.pdf
    • https://vagoledos.weebly.com/uploads/1/3/5/3/135320004/fejefokibaxexu.pdf
    • https://cdn.sqhk.co/powirafawume/cV2jijc/great_battles_medieval_save_game.pdf
    • https://cdn.sqhk.co/dorejewibiz/jOgcggV/stampede_temecula_open.pdf
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/deliradovadu.pdf
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/63ae9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_b2206b5d2c7b46529f12f97d296a3ce0.pdf?index=true
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_4fac56f811a345a2a5e72786075361be.pdf?index=true
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_19f33c3f52fb41bdb8cd24aee18e46fb.pdf?index=true
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_ed31bcba31644853b419c55eec052d44.pdf?index=true
    • http://julivaradisakit.rf.gd/42506044176.pdf
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_142fc050032641c7875a07891d6657a1.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_3c671aed15de4fc68c76f538fc6da0c8.pdf?index=true
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_1e2937a522fb4279a9d01e8893ab2886.pdf?index=true
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_0e7110323bb14b32a3150c4b56484146.pdf?index=true
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_a0bbec2a3d1b41f4bb9a381b2f6d2115.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_0086813ca27a47fda5eee6442f1c5f54.pdf?index=true
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_cc71bbf766c34bc0a36283ba65a7a28f.pdf?index=true
    • http://vurorawoguw.rf.gd/windows_small_business_server_2011_standard_iso_download.pdf
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_ebf80cf5be93414d9e43fe99f012c9b3.pdf?index=true
    • http://tapogexolewiji.epizy.com/japanese_denim_sheet_music.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_b2f94b61ba56439fa08e05d06a1ad783.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_off0000e39e.bin
feadb4b6c15194d3ee680a3bc86c51e1d64432f86afacf8a4819aac2e4e63a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 5068 bytes
font_01_sfnt_off0000f508.bin
82bddca14ecb92b40604d5827be4d7bb845655fab2ada440508c0bbaa775d88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10892 bytes

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