Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86a8a01f88e4143…

MALICIOUS

PDF

96.8 KB Created: 2021-04-22 17:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cabe82007a029066de327f09b78581a8 SHA-1: 6a79350ef385130516e9347acada1e1702c9a7dd SHA-256: d86a8a01f88e4143f4097f57ed940a40745450fe894b6a1f04be1dec899d991a
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of numerous links, including one pointing to a malicious redirector, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=english+speaking+tutor+online+india In PDF document text
    • http://naxajogilelog.medianewsonline.com/mipom.pdfIn PDF document text
    • http://znakomstva18x.site/kalokuleigghq.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/89786772892vtao9.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/gczii9v/jefufitetoninivirinuv.pdfIn PDF document text
    • http://blockingscenery.com/13400253895dyjz9.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/XqQrujj/97809830365.pdfIn PDF document text
    • http://kibidusivojigo.iblogger.org/300_logical_fallacies.pdfIn PDF document text
    • http://gomijexa.mywebcommunity.org/33523794475.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/BUifP7c/pazonideririrejovafufefus.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jjbjGMg/wordscapes_level_8522.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/sadifavupefa.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/Widhjia/multiplication_and_division_inverse_worksheets_year_4.pdfIn PDF document text
    • http://eurozone.pro/vusetojkv3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kelamivajaw.rf.gd/30216640902.pdfIn PDF document text
    • http://bonanelokuweje.rf.gd/deep_ecology_principles.pdfIn PDF document text
    • http://jopodatus.rf.gd/caballo_de_troya_10_el_dia_del_relampago_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94b3566-b97c-414b-9428-ff54f489e3e8/robetujisolisufusajaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5ff3f3-f294-485e-88fa-32237756ba57/44719785616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1173c7a5-bc31-42de-b54a-f315930ebdf3/active_and_passive_voice_worksheet_grade_6.pdfIn PDF document text
    • http://fokerek.epizy.com/amp_human_performance_where_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fd5a4f-f563-4dff-aab3-7e17170c2015/garmin_fenix_2_gps_watch_review.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_d273f0cde88a4b10a602a8edde7951d9.pdf?index=trueIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_a3c2739aabb34f7d82d8ee95628a61b4.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_2107b788259645ac91f594ad95e45025.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 5124 bytes
SHA-256: 915d70c1d31a02e084e7ffa477dcbf80275c320a5fe890a5f5dce19b8771e881
font_01_sfnt_off000141b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B4 11312 bytes
SHA-256: d90a730976b403bd6fb622008af29d10d2cad2f292046c653e952c20fa1aa6ac
font_02_sfnt_off000167c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c