Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58e48b3fbf47233…

MALICIOUS

PDF

79.6 KB Created: 2021-06-10 11:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf6d4a520d72c17eab960054cac6aea1 SHA-1: c334cd4344ae3529fca8d9dc91b9b71d0f5f8a8d SHA-256: e58e48b3fbf47233b9247db64ce02e763447d2d17ae6848890ed7d2dd3421102
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm designed to improve search engine rankings for malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through deceptive 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://lozipotod.ru/wb?keyword=minuet%20in%20g%20sheet%20music%20easy
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fccdd57cfe2b.pdf
    • https://mumetepelexax.weebly.com/uploads/1/3/4/4/134461787/vulesikawaw-wadujuduni-ronunubofe-laxemegufuw.pdf
    • https://static.s123-cdn-static-d.com/uploads/4487625/normal_60b448f17b83e.pdf
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5feb62495046c.pdf
    • https://wufaxewixebel.weebly.com/uploads/1/3/5/3/135302410/lajedikupekelak-vunezozitevuxu-rufelo.pdf
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/9433109.pdf
    • https://static.s123-cdn-static.com/uploads/4501231/normal_5fcf6ed5385b0.pdf
    • https://gupifamerimim.weebly.com/uploads/1/3/4/1/134132082/976088.pdf
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/winabidot.pdf
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/7c14edee99.pdf
    • https://mepuralomelefaz.weebly.com/uploads/1/3/4/4/134494325/b215254be91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/717ece42-5d39-427b-9fa0-322532a87f47/zipopidure.pdf
    • https://uploads.strikinglycdn.com/files/5b51ca63-758b-4838-aedc-ba3c300dc729/16832066944.pdf
    • http://zipiwume.pbworks.com/w/file/fetch/144734946/ios_13_launcher_pro_mod_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/bdb9b219-173a-46e9-b5d0-ed3e1893a375/united_states_history_since_1877_textbook_answers.pdf
    • https://uploads.strikinglycdn.com/files/8952304e-1618-4897-9ec5-94fa7fdf6ca4/love_ni_bhavai_full_gujarati_movie_hd_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/b2bf05ca-8ae2-40f5-8280-39f497225814/finding_area_of_composite_figures_6th_grade_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/4a5501f9-a781-4d1f-8c2c-19affb2376b4/gufot.pdf
    • https://uploads.strikinglycdn.com/files/1b56a104-3b3b-4269-ba8d-66aa01929e0d/8020855903.pdf
    • https://uploads.strikinglycdn.com/files/9eb83741-87b6-4662-8a83-2ead6caad6a1/bowuvu.pdf
    • http://lekuzax.pbworks.com/f/maine_pyaar_kyun_kiya_mp3_download_pagalworld.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_off0000f99c.bin
16ff77a1a1ba3434f1a7b807b09bceea67a58d8d2025a82ae14d4fe159e86aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 5192 bytes
font_01_sfnt_off00010b3d.bin
fb9f32b48bffe0c85e351e1c235cad2bf65cf1abd63e7f73f791334ac8ec8487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 11084 bytes

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