Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d0edcd6c62300e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 13:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5063480662d5cd886ea208b7961f4dd8 SHA-1: 67e8e37fd3a6474c4ea3190b7835dccdb16961e4 SHA-256: 65d0edcd6c62300e72f8e70c745ecdf32d8c6536402c6cdb614a9d57ecc31f9e
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'https://dafemum.ru/strik'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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=what+is+solvation+enthalpy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_600c1dfb7a04d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fcb911bd5b47.pdfIn PDF document text
    • http://tisiner.iblogger.org/biografias_de_personajes_importantes_de_mexico_cortas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_60219e3c4af58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fd33d94b1f05.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/didowugorokirug/simulador_ser_bachiller_2018_descargar.pdfIn PDF document text
    • http://lalowarereguwel.epizy.com/web_programming_step_by_step_free_download.pdfIn PDF document text
    • http://mopiluganaloriz.epizy.com/rusty_corrugated_iron_sheets_for_sale.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_500b463cfd4142c3a9daca1226a3838f.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_d82b2d330f5d476aa50dc30d0969ed56.pdf?index=trueIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_998947b835714805b4e040b5983aceb6.pdf?index=trueIn PDF document text
    • http://wupaxine.epizy.com/rafibigijik.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_26c9f84042f544b2a853a684bcb8c2d3.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_a78cb2b31e124e86bc3b8f05b13d3abf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/girosorakolujeguse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb6786e-8ff7-424c-9767-683c20172735/rubugabezetomemaju.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/herpes_zoster_meningitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/list_of_connectors_for_writing_task_1.pdfIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_a7c75e03dc69436db830c9e08477b71a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9cede6-b03f-4bef-935d-99b5f8f097da/what_does_the_middle_weight_on_a_grandfather_clock_do.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/revenant_gw2_guide.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_90c6a0f72b4841fb803660f6f977bf3b.pdf?index=trueIn PDF document text
    • http://nokubivuva.rf.gd/fekal_koliform_bakteri_nedir.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_c6c5cf67df7c4ede8a84e184bde72953.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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 4772 bytes
SHA-256: d676672a9ebc98651908342d92393daae7047991e0c99d7ca6c33f132cc2df25
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 11024 bytes
SHA-256: b60fab7dcbfb7088cd6c711a6ef207334c6e741375a1ccf61f263c4343928cf8
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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