Malicious PDF — malware analysis report

Static analysis result for SHA-256 de02131e693cf892…

MALICIOUS

PDF

80.1 KB Created: 2021-04-05 17:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f847214c6a912b0baafa3abdec412202 SHA-1: ef000d781965b5ac417c4c6d7f4cf639976b88a3 SHA-256: de02131e693cf8922a5672b88f9eb995a8cd2d6f57bca7fc766ca01304e2a4f0
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to educational worksheets, while the numerous embedded URLs, including one pointing to 'seumenha.ru', indicate a phishing or link-farming attack pattern. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, suggesting the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=animal+adaptation+worksheets+5th+grade PDF link annotation
    • https://cdn.sqhk.co/wefegiwezon/giicJpL/fmk_online_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/gijaggT/61733609342.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/badminton_playing_techniques.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/videosecu_ml531be_tv_wall_mount.pdfIn PDF document text
    • http://lanizimugigil.getenjoyment.net/jupegofafesamu.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/xotufunaliwesojo.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/witupilojegapadupuvel.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/hiU3gj1/40598681973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nematamaduwos.epizy.com/castellan_fisico_quimica.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/ignou_admit_card_december_2019.pdfIn PDF document text
    • http://sefegotanekexe.rf.gd/baby_bjorn_bouncer_safety_harness.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_044d83544df2401ca9fbb9cd40360d75.pdf?index=trueIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_de0545b821b74732b9dd56e8abf41d9f.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/los_actos_del_hombre.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/34780373635.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/balloon_bow_and_arrow_game_free.pdfIn PDF document text
    • http://wetovokerug.epizy.com/interventional_cardiology_board_review.pdfIn PDF document text
    • http://kewupuz.rf.gd/rivonenelug.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/kolov.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_e7f2abddfd21486783e8de4f6081bb04.pdf?index=trueIn PDF document text
    • http://kukejisagev.epizy.com/36760420549.pdfIn 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_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 5644 bytes
SHA-256: 4a6d0c3c373f6b0ed583c4d933c31b79262d39f38c00ad1d7d6a33446a7264b2
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 10924 bytes
SHA-256: fb0f01890d08eb65780c070e2549a49e8975419b9e5507ddaa863860c57ef633

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