Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f17b4edecc237d0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 01:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3535c3cf351c0b7a3e77424e2c7ec4ee SHA-1: 2f0f6703ab41b659e408ccdd8d79e759e85892da SHA-256: 5f17b4edecc237d09f3728dea6e3e4059651f4c10bda5b62779371d311c8aab3
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, with a high concentration of links on disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://nipisod.ru/123?utm_term=fresher+resume+format' is a primary indicator of compromise, likely serving as a lure or a redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=fresher+resume+format PDF link annotation
    • http://mufadapi.22web.org/math_teacher_s_guide_grade_9.pdfIn PDF document text
    • http://vimebadu.22web.org/4824082824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_604cbcef91be8.pdfIn PDF document text
    • http://zakiwejila.iblogger.org/zujenanuvotezete.pdfIn PDF document text
    • http://ziwegiwe.iblogger.org/13261927335.pdfIn PDF document text
    • http://bosivutefap.22web.org/gosofirunozafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_600e52b69bf28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5ff08607874ad.pdfIn PDF document text
    • https://gusefokujugox.weebly.com/uploads/1/3/4/0/134040973/migixasixupawavujod.pdfIn PDF document text
    • http://lemoxovuv.22web.org/27428589902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_602c954d2eed0.pdfIn PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/mavezitifom-repife-nidiga.pdfIn PDF document text
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/a0e81d7b65.pdfIn PDF document text
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/nulosaziba-kulironivudix-nubaxiponotisix.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/7878695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce48fd1-2bce-430e-8775-c643493ffea4/how_smart_traffic_lights_work.pdfIn PDF document text
    • http://rufofexejojar.epizy.com/azbox_bravissimo_transformado_junho_2019.pdfIn PDF document text
    • http://sisofejijo.epizy.com/kalender_2020_juni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55162510-49d5-4d6d-bc53-cf0cef552be7/how_does_cyberpower_surge_protector_work.pdfIn PDF document text
    • http://fuvogel.rf.gd/maze_runner_cast_interviewed_by_cartoon.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_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 4932 bytes
SHA-256: b5be181c42a6653756871f84be8320b7c2582ee449bb4c99de46992d31a02eef
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 11000 bytes
SHA-256: 673a17e0bc8007f7e3e8494aaef9f56c87724c9a00a17c4a55d5f546fcf6a36a

Open this report in the interactive analyzer, or submit your own file for analysis.