Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18c2f1eeb62f793…

MALICIOUS

PDF

84.3 KB Created: 2021-03-01 11:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cc93f7ba63adf771a032acd486f8e84e SHA-1: 7a7e076f018f955163a9e17395b28d7675736074 SHA-256: e18c2f1eeb62f7934144a41ebea2c2226981dc6dcd6d4c1bb55fd81d6e556d2f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to 'midufefew.ru', suggests a phishing or malware distribution campaign. The PDF also exhibits characteristics of a link farm hosted on disposable domains, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=burger+king+breakfast+prices+2020 PDF link annotation
    • https://cdn.sqhk.co/xojelumegasi/orNQghL/mifafofijaxivizopezip.pdfIn PDF document text
    • http://harmony-market.ru/vanilla_wow_frost_mage_leveling_guidec0eyw.pdfIn PDF document text
    • http://devgame.design/burma_tv_apk_for_iosgh5zs.pdfIn PDF document text
    • http://evatopshop.xyz/46943235289enm0i.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/prigogine_order_out_of_chaos7tjdt.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/79841334910vau1n.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/57932250378.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/senuresotewizilk9o23.pdfIn PDF document text
    • http://grampus-shop.com/62828646051iv8r3.pdfIn PDF document text
    • http://klokisik.space/medium_sudokuzxulb.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/AiaiWEk/sonic_adventure_2_battle_chao_egg_colors.pdfIn PDF document text
    • http://sayfelengs.space/affirmative_negative_and_interrogative_sentencesn71tc.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/hejjGl0/toys_toon_blast_crush_puzzle.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/XggaiF8/parkour_race_free_run_game_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 5676 bytes
SHA-256: 5b4e86dc8bc0237e72cd7c9d3d66c9f73cecfc23784e7cd165e2fa794ba6f6ec
font_01_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 12076 bytes
SHA-256: afd8c2d86e4d740bd3f79b1dd0ced1d2e4b0a3dc4c154bd1a6abc3aff1c44bce

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