Malicious PDF — malware analysis report

Static analysis result for SHA-256 7664ded9f6c90bd9…

MALICIOUS

PDF

80.7 KB Created: 2021-04-12 16:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177ce40a37b2167f144eebb64f7f57e8 SHA-1: c5b001defe2ccb9c06e04141a526ffa0e53fe44f SHA-256: 7664ded9f6c90bd99ed7583e183e6af7c6dfe4ba28dc7b816a998d3eee7e7367
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links pointing to disposable hosting, likely to obscure the true destination or evade detection. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=argumentative+essay+outline+template+middle+school', are the primary indicators of this attack pattern, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/strik?utm_term=argumentative+essay+outline+template+middle+school
    • http://rabota-plus.club/how_to_use_frigidaire_dehumidifier_70_pintyzezy.pdf
    • http://kkkirrreeee.space/free_editable_invoice_template_wordhypvc.pdf
    • https://cdn.sqhk.co/wanowofimaz/higsY4a/walking_dead_season_10_episodes_free.pdf
    • http://mirror-x.org/probability_and_random_processes_scott_miller8a5bf.pdf
    • http://lagejarejitog.mypressonline.com/poxaganigireni.pdf
    • https://cdn.sqhk.co/nuroteditu/bjbzjaN/lekedijedug.pdf
    • http://futigovu.scienceontheweb.net/75516645023.pdf
    • https://cdn.sqhk.co/gidulikegel/l8agibM/dobre_dunk_poki.pdf
    • http://lorakuze.sportsontheweb.net/us_billionaires_got_richer_during_pandemic.pdf
    • https://cdn.sqhk.co/guvevifowo/vjjgdgj/wotefokepomesuzisolanej.pdf
    • http://xazowagef.mypressonline.com/pdf_astronomy_today.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a8af4fe4-322d-43e8-b2a6-8854bddbe4d7/a_la_casa_de_espiritus_malignos_serie.pdf
    • https://uploads.strikinglycdn.com/files/092ab885-4bc7-4eed-87d6-7386506b00b0/the_wrath_and_the_dawn_webtoon_ending.pdf
    • https://uploads.strikinglycdn.com/files/1600ebc7-cdae-4f49-b545-7a0ed6fdcada/40783939800.pdf
    • http://kimoviranonaf.onlinewebshop.net/fewolajufatolovupizesojis.pdf
    • https://uploads.strikinglycdn.com/files/5793e965-27f6-47be-9374-66b9772714e1/is_a_jump_discontinuity_removable_or_nonremovable.pdf
    • http://zatuvejamubolo.atwebpages.com/semesewexemuv.pdf
    • https://s3.amazonaws.com/jalasilunaz/35714039638.pdf
    • https://s3.amazonaws.com/genedonapubefe/ontario_executor_compensation_guideline.pdf
    • https://s3.amazonaws.com/dipafuxe/27622173940.pdf
    • https://uploads.strikinglycdn.com/files/b2dee0d3-32c4-47dc-a40a-e13b7eba5ac7/traxxas_summit_brushless_top_speed.pdf
    • https://s3.amazonaws.com/luropi/advertisement_worksheet_for_students.pdf
    • https://s3.amazonaws.com/gavobawum/molebefovixexedukanarapos.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_off0000fdc8.bin
fb8f18e3c3eb7b9b7c6613e668ff790e6036230a2794e52819e28ccb9ebd2d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 5640 bytes
font_01_sfnt_off000110d7.bin
f00a7984c8b5efa55caff78dd875611ad4d1cdd61b2534f27dd561f731ebcff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 10756 bytes

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