Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d8320fbcd4eb14…

MALICIOUS

PDF

101.0 KB Created: 2021-03-17 04:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5957e1f9537de77e2815e454bc81abe8 SHA-1: 93d8fad73cf40613ab5e87bccb38b8883f4a124a SHA-256: 58d8320fbcd4eb14a249766b6434f9caea1d20ee019041e11ae020f467c4b5c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a lure for 'math 9 answer key pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=math+9+answer+key+pdf
    • http://aydym.club/minn_kota_riptide_70_wiring_diagramok07k.pdf
    • http://shopsmmv.site/tank_vs_missile_fight-_war_machines_battletechm899f.pdf
    • http://nextauto02.ru/taxeremogawuganelinovotcz5hj.pdf
    • http://demask.space/exercicios_cnidriosdfptg.pdf
    • http://vpntop.info/intermediate_piano_sheet_music_freeguju4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_6380245f14c34e998b110810ae5469cf.pdf?index=true
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_82d9ab95d41f46c7aaf8b2d4f05a0d45.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_80d9495f0274474fbb7b6ee3440f0262.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_31502bd6145f47b9a6cfff24a4a6152f.pdf?index=true
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_27ac1056c3af4d20bea542504461d070.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_939a8a78fb7a4300b57a5f2b1a699c94.pdf?index=true
    • http://mewokusexet.epizy.com/data_modeling_and_database_design_2nd_edition.pdf
    • https://143c7e3e-1a56-4739-9c24-5aac26b0263b.filesusr.com/ugd/28d7c1_6735939571b545d2b044d87dd14d96d5.pdf?index=true
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_5de5159f05ce4b5591799ef1d190bddf.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_0a7119bfc58c4cb08fe07beff35e38ca.pdf?index=true
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_c90ab1780a65487b9506009b875f930d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1c4fc5c-d013-4a32-9fd1-4745e292b6d0/99201607594.pdf
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_2199d34e9e074fbe88c5db46c4f4854b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b41dba6-352f-4ec7-8ef7-650f229e8773/11035140848.pdf
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_0364e8c715184beda1536d3818750b5d.pdf?index=true
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_81c5d566e5974576af38f2a199c0150c.pdf?index=true
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_59c8e9aa00754119af7574ef173a043f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ae4.bin
3e0b73fc31147c1465236cbcf1bf802ff4ef6e33caf6b512c1d3743d6139b119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 5144 bytes
font_01_sfnt_off00014c66.bin
e96137108d6da073142240520a5ca704f58f576b3cc9c337763fc1822ed2e25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C66 13224 bytes
font_02_sfnt_off000178a6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178A6 4324 bytes

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