Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c6d731e6735f50…

MALICIOUS

PDF

77.1 KB Created: 2021-03-08 10:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67a4215a7d26cad1c517c8c8c25c5598 SHA-1: 24bf11c23a9880dd627b7a8aa18fd0fbbd7f07eb SHA-256: 39c6d731e6735f50a8e6339ce8bafee3f2d29bdae66d43b4785103df52199857
156 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which are SEO-themed and point to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document likely serves as a lure to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=aufgaben+passiv+englisch+pdf
    • http://enots.space/action_adventure_games_pc_freea1qay.pdf
    • https://cdn-cms.f-static.net/uploads/4427300/normal_603debeb4a224.pdf
    • http://magnifioco.site/ford_mach_e_gt_review2hlg9.pdf
    • https://cdn.sqhk.co/mopewedote/igXeWiE/swot_analysis_examples_online_business.pdf
    • https://cdn.sqhk.co/kepebeso/hde7U4D/bagiforenasovuxazajerizo.pdf
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/wixizok.pdf
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/7048980.pdf
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/kojowavapeno.pdf
    • https://cdn.sqhk.co/voxedifi/wjihjcG/92190311847.pdf
    • https://cdn-cms.f-static.net/uploads/4464874/normal_600f2edebc600.pdf
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/70022efc09.pdf
    • https://cdn.sqhk.co/jonuwezipagi/uhcIhhz/92962084209.pdf
    • https://cdn.sqhk.co/suwajipufo/rianijz/sports_heads_soccer_2_hacked.pdf
    • https://cdn.sqhk.co/nupegefozub/fgeMCZH/89221340662.pdf
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/nikigotalowugopizage.pdf
    • http://podcard2020.site/sas_ods_excel_format_number9snvn.pdf
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5fcff2be4084f.pdf
    • https://cdn.sqhk.co/rubogomuweme/aPibms7/among_us_game_play_online_for_free.pdf
    • http://mirror-x.org/tarubizameneget2kgvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14f3c7a0-a7e4-44ba-ba95-94172215ced5/what_are_the_four_estates_of_democracy.pdf
    • https://uploads.strikinglycdn.com/files/5df70af3-2cee-4ba7-92e9-2bb3f12d58d5/which_book_is_best_for_political_science.pdf
    • https://uploads.strikinglycdn.com/files/af2f9f75-76af-464d-97bd-0b9e8c53c982/nixon_the_corporal_gold.pdf
    • https://uploads.strikinglycdn.com/files/0c3b138f-1a6a-41ab-9aaf-f032c87013ab/53217318861.pdf
    • https://uploads.strikinglycdn.com/files/6b6b76b2-ab23-4050-bfef-1f328d3d89c5/bizob.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_off0000ef6c.bin
82873c178b7d46cbe7f03c966ef235b122dce5db15e4bca778658632c451877f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 5508 bytes
font_01_sfnt_off00010236.bin
8c91c6fd7ecf2707ae1ee810ce68b384565d35ccab01ff18bc1dd9832353823a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 11200 bytes