Malicious PDF — malware analysis report

Static analysis result for SHA-256 9711846a887608ce…

MALICIOUS

PDF

97.0 KB Created: 2021-04-08 17:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccd7eedd9741b6d69dea6d95bb6546d9 SHA-1: 814c072fe50701785ebc638c77d34f2946ada55f SHA-256: 9711846a887608ce5ae3f771d4e50b27385a6e157c74c777cd52faeb5b6a5692
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The embedded URLs suggest a link farm or distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=is+toro+a+good+brand+of+zero+turn+mower
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/62c3949.pdf
    • https://cdn.sqhk.co/tinupolureg/jeWLjbB/62873508164.pdf
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/1580800.pdf
    • https://cdn.sqhk.co/rawatajizefu/jfHShjP/14125394595.pdf
    • http://fineagencyy.com/what_was_operation_iraqi_freedom3b6bg.pdf
    • https://cdn.sqhk.co/jafiwimeg/WsherrD/chicken_crossing_the_road_jokes_dirty.pdf
    • https://cdn.sqhk.co/budajawisore/jd3giBA/texas_longhorns_softball_score_today.pdf
    • https://cdn.sqhk.co/wazikunal/z3hbigX/wemop.pdf
    • http://trendmobile.ru/7820832671oz1ja.pdf
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdf
    • http://tryraisins.pro/gawepijaxotuselalamw1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cadde69f-b382-493b-bfd8-e5ee97a559c4/highway_capacity_manual_level_of_service_definitions.pdf
    • https://uploads.strikinglycdn.com/files/1a183714-b8ab-42d2-9ffe-6a6e21a1fd7b/biblia_de_estudio_plenitud_descargar_gratis.pdf
    • https://uploads.strikinglycdn.com/files/8140be2d-eccf-4096-b689-509157eed2ac/how_to_use_shark_pro_steam_pocket_mop.pdf
    • https://uploads.strikinglycdn.com/files/e9c8b3f2-3e6f-4c9f-b2ba-bffc02b89f21/66414007620.pdf
    • https://uploads.strikinglycdn.com/files/0303493b-f9fe-4991-80c4-96138dd35cd7/tokorezowukil.pdf
    • https://uploads.strikinglycdn.com/files/866df70c-6e5f-43a6-b8c3-5abd6c51f261/32818316405.pdf
    • https://uploads.strikinglycdn.com/files/e0fce8db-5f23-4f9c-9eb8-abe5cb714846/what_is_lady_macbeths_purpose_in_the_play.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a42.bin
c7918d39a7b5e836dc18b416437e0c3cb0ec08af3e337d5b47f561b003c1e3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 5416 bytes
font_01_sfnt_off00013cae.bin
16c6af11f6680ecdea1e74f6fdde0fe009227bab08f64278102ccc04eb0da9b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAE 10876 bytes
font_02_sfnt_off000161ec.bin
c26df5a654703d82c4b49e3d99d7624c72720c83e2144c41d2616ef18af3c653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161EC 16076 bytes

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