Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4b33ca25047e06…

MALICIOUS

PDF

109.0 KB Created: 2021-05-16 08:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f1dd035d8f7d8583861f6ef1873e0a2f SHA-1: 7b598ca5b4852accbbc00eb0f384f286a890d03f SHA-256: ed4b33ca25047e067f53496b3db26654f651f4f2b5005cee8f9d75be8cbf015c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=social+learning+theory+holds+that+employees PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fd69a835e54c.pdfIn PDF document text
    • http://lulikike.iblogger.org/xixudulisedemepowinew.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://juvugewit.iblogger.org/punnett_square_dihybrid_cross_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/7dd7w0p/dunkirk_ny_hotels.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/ibMvk57/best_cashback_deals_on_broadband.pdfIn PDF document text
    • http://fruittea.space/50539294534j58qx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_606a93b5b4fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_605127b295d66.pdfIn PDF document text
    • http://techanomic.com/administracion_de_medicamentos_via_nasal_definicionjfazy.pdfIn PDF document text
    • http://stonersfranchise.com/98048720634i6xh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_6034ca157329a.pdfIn PDF document text
    • https://cdn.sqhk.co/tigadikem/dDjjiid/74493353191.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
    • https://s3.amazonaws.com/pubopelej/pipifegizujekaxukasogob.pdfIn PDF document text
    • http://fudowoxalukiki.rf.gd/3622145076.pdfIn PDF document text
    • http://repuvamiperubo.epizy.com/consumer_reports_cars_2019_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf99f853-0913-40ba-86b4-6d048fbfd5f1/zotoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5598aa4d-d11a-4b1c-9c48-9c1a0cf9384f/3857606644.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/cheat_engine_6._5_1_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d24938b-e256-4bb9-86e7-8f11c6c72215/the_shining_movie_hotel_oregon.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/clonezilla_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87a0174-3967-47cc-95cf-8b53456f7788/27270090860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a90b9b-293d-482d-9d54-9841ec05299e/how_to_layout_a_45_degree_elbow.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/bazaar_full_movie_720p_hd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E35 5480 bytes
SHA-256: f58bb805c1764de28d0e68ef098b6c1657ba9c9cd7dc1117f0c95369a5ba207e
font_01_sfnt_off00017096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17096 11588 bytes
SHA-256: 9e899bd689269ca51a17bace6fa7091e00b0a4e602bf9975333225f5f7b2338d
font_02_sfnt_off000197de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197DE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f