Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dc58e21e1160e8…

MALICIOUS

PDF

79.2 KB Created: 2021-03-10 09:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81b94518fa70ae36a155fafbf5c744b4 SHA-1: b9ba76bd21c11a75ec05cb19cb53b72d0877034b SHA-256: 44dc58e21e1160e8a2a3207e2d6543163f13df2d13c95fa1bde65bed4db6bfb4
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to common Korean words, which is likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=10000+most+common+korean+words
    • http://sweetygirl.club/calculating_net_force_worksheet_middle_schooledjau.pdf
    • http://steelsho1.club/main_causes_of_poverty_in_kenya50t2e.pdf
    • http://digitaltoolsfor.xyz/mn_drivers_road_test_requirementsrfl5u.pdf
    • http://ig-mediateam.net/51186097012cyh4o.pdf
    • https://cdn.sqhk.co/kufagilan/KzUjhUV/best_punjabi_video_status_for_whatsapp_download.pdf
    • http://mscredit.info/68811912213xapge.pdf
    • https://cdn.sqhk.co/rujiwujik/cj6GhaF/79777126794.pdf
    • http://bhd-management.space/rescue_911_pinball_manual4hxrz.pdf
    • http://raicen.com/ikea_malm_single_bed_instructions_2017kqx52.pdf
    • http://folugomobok.getenjoyment.net/what_is_colonial_discourse_slideshare.pdf
    • https://cdn.sqhk.co/jigitovewuk/Ahhgjjb/24394857815.pdf
    • https://cdn.sqhk.co/xubewarow/hgd5JA8/secret_of_mana_remake_multiplayer.pdf
    • http://tezuveripoxub.mypressonline.com/wunorowe.pdf
    • http://uspex22.online/normas_juridicas_individualizadasp8x1j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dutimajizowa/66200057608.pdf
    • https://s3.amazonaws.com/xovekolamoxe/69309480369.pdf
    • https://s3.amazonaws.com/sitozi/badnam_kar_diya_pawan_singh.pdf
    • http://koduwutuvage.onlinewebshop.net/79279503956.pdf
    • http://mijovutotukedes.onlinewebshop.net/calendar_november_2020_printable.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_off0000fa6a.bin
ea021b0ff28ca4b43c9cd7bc9a603fda438a68ff1aea962b95a3123c219e4bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 5308 bytes
font_01_sfnt_off00010c75.bin
46d6862620e2d8ae4b041fce651fdc7f0d5a3b2d8dac25e2760941e957e4926b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 10316 bytes

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