Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f3031617257577…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 03:38:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ad44617f8e28b123dd7292539f46988 SHA-1: 7c224804c28c01b1d828daa3576349c7bc607e42 SHA-256: 45f3031617257577d2e2b5d21075e26241ea1cce32b0ce31a5a313db7ccc1874
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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://resalured.ru/wix?keyword=is+skillshare+worth+it+2019
    • http://1xbet-registrat.site/2013_porsche_cayenne_turbo_performance2l7no.pdf
    • http://sdorovie-sustavi.xyz/490608037933bik9.pdf
    • https://cdn.sqhk.co/zujubokave/jbjfwxD/get_more_likes_on_instagram_apk.pdf
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/9025647.pdf
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/304825.pdf
    • http://vertigoa.online/how_to_compare_grocery_prices5stgv.pdf
    • https://cdn.sqhk.co/pelotuwew/3gTenJd/raid_ant_gel_reviews.pdf
    • https://cdn.sqhk.co/kafufojugure/hVgdoha/monkey_bar_fight_game.pdf
    • https://xofijenafoku.weebly.com/uploads/1/3/5/3/135349300/votajofewidim-joxelokatujiwet-fibekigere-zuvolifa.pdf
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/c0750380cb.pdf
    • https://cdn.sqhk.co/xafogatok/a6CibU8/maserati_quattroporte_gts_0-_60.pdf
    • https://gajitiromivalot.weebly.com/uploads/1/3/4/4/134475956/boxuwagajaro-sagubeveguj-kujenelupu-sopaditip.pdf
    • https://cdn.sqhk.co/gorokipo/j2hd5Nu/donamelezisetomozit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f7f547f3-740c-460e-b772-027beacbf364/where_do_komodo_dragons_live_on_a_map.pdf
    • https://uploads.strikinglycdn.com/files/3b370daa-ff0d-4528-9beb-dc9514769344/dark_sun_shattered_lands.pdf
    • https://uploads.strikinglycdn.com/files/d24ae826-9787-4e12-8482-1ca027efe60f/fobemiwisofibenexoge.pdf
    • https://uploads.strikinglycdn.com/files/9421c56f-67a7-4af1-a7f9-094af2ba9f6f/zopesuzumiku.pdf
    • https://uploads.strikinglycdn.com/files/2fedbf39-145c-43b0-8fa8-a13c37f9ecd1/how_to_teach_senses_to_grade_1.pdf
    • https://uploads.strikinglycdn.com/files/6f0d182b-16ec-4397-9c1a-436e6317a850/burger_king_fries_carbs_small.pdf
    • https://uploads.strikinglycdn.com/files/37eae93c-0e23-43c4-a202-c29da32c956f/57635283795.pdf
    • https://uploads.strikinglycdn.com/files/2184fa89-10a5-4b09-9571-99de4cf037d7/91739160149.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_off0000e730.bin
361d6b442f9f8c8756e6509c78c3b60c9f02ccd24f7bae9ea145765e78b3696c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5348 bytes
font_01_sfnt_off0000f96c.bin
03972c9665c746615fd17db7aa6d21b3fece16cb1d1251c7db3962f620f31847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 10664 bytes

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