Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fe401fcab274de…

MALICIOUS

PDF

89.9 KB Created: 2021-05-08 03:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 58192c6a36d83f8b6528cc4aa4d5106e SHA-1: f3d4e221dfbc614f150a0ce67c20d67c6fc0fbf6 SHA-256: e4fe401fcab274de03e63ca5ebec877ff82e6116c87d5202c9637234da97715f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URIs, with a primary malicious URL pointing to 'pelibifir.ru'. The document's structure suggests it is designed to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=estudio+biblico+la+oracion+eficaz+del+justo+puede+mucho PDF link annotation
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/suwopasokogexuf_ruteduf.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/saguzumu_fejezinof_malerozesaru.pdfIn PDF document text
    • https://titamifafipife.weebly.com/uploads/1/3/4/3/134315234/wuwezokuxizewi_zagiwepepalufi.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/1497551.pdfIn PDF document text
    • https://wapolamezabez.weebly.com/uploads/1/3/4/0/134041225/litipewimebiva-lupomi-tipibipube-jiroj.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/caf70d74-bdfe-42b4-b77d-a5c428ed281d/792291296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7671a5d-9e24-46aa-b424-0deb72638f53/conversation_english_class_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcfd835-1c63-45d5-a8b5-6a33899b802a/zefuxizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5271fbd-c95e-4e9c-ba0d-8431d8e6f08f/wh_questions_reading_comprehension_worksheets_kindergarten.pdfIn PDF document text
    • http://jukiwifid.rf.gd/acronis_true_image_home_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/response_essay_sample.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_0b715f848a15491fb4962dac52c43355.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6481342c-2d0c-4300-82bb-f0e5be8ae3cb/66457184439.pdfIn PDF document text
    • http://figofubinodafe.rf.gd/33786046242.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_ece8caa29ef94bdab85554664178b5b1.pdf?index=trueIn PDF document text
    • http://fedubumisuvek.epizy.com/advanced_mathematics_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b20759f-e7a0-4768-b617-4fb5840760c2/45540797490.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_074b2176a8be4677a9d50dac0989fbda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0710872-722b-4a15-8e20-821da7bf68eb/wawuwijiwafok.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/what_is_meant_by_half_life_of_an_isotope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254d8274-3971-4a9d-93a1-a6fb329baa2b/the_highwaymen_song_lyrics.pdfIn PDF document text
    • http://fukewabukitiv.epizy.com/jezizonopufififovix.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_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 5616 bytes
SHA-256: 20b1998ae40772e319c30fbba2bc5f820a4f4e1e403794bb268c0da6d525d17f
font_01_sfnt_off000130ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EF 12104 bytes
SHA-256: 68b65bf32dae9e755408e21776055d6b015c8046ee06b5a159c398181d5785c7