Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76d75ef46b1bfe0…

MALICIOUS

PDF

72.8 KB Created: 2021-03-27 22:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 07bd39c889d8e796a7d10a766ac7e87a SHA-1: 313dc69c7db07ba3891d6b02bcd400d2a51259fd SHA-256: f76d75ef46b1bfe0a528094dd90e6c608a716f887f5f555aa123743655b88836
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=complete+pet+for+schools+pdf+vk PDF link annotation
    • http://ctuxuu.com/organismos_centralizados_ejemploshz1m7.pdfIn PDF document text
    • https://buvelixajotoneb.weebly.com/uploads/1/3/5/9/135982000/6825689.pdfIn PDF document text
    • http://gesemalisezusa.iblogger.org/66005124835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485826/normal_5fc7bd0c3b244.pdfIn PDF document text
    • https://vuxorewuv.weebly.com/uploads/1/3/4/8/134861163/penabosuzajufix.pdfIn PDF document text
    • http://bijatutolime.iblogger.org/responsive_navbar_bootstrap_4_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fd6292231193.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/learn_c_language_in_hindi_for_beginners6e6od.pdfIn PDF document text
    • https://xejevegufukax.weebly.com/uploads/1/3/0/9/130969627/58b183.pdfIn PDF document text
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/7413908.pdfIn PDF document text
    • http://floradoma.net/worksheet_on_triangle_congruence_postulatesqelck.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/45fcca02-503a-4aff-83e5-fb309e796456/vemibiderinuvitimug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7b9e9e-fdfc-4195-8b16-9509b0eb04d6/jude_the_obscure_free_download.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_31aa18e9ae944d479ab10b48fe50acbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee088dd0-fa8c-4702-98e0-9218364bf6bf/canciones_de_piano_faciles_para_nios_con_notas.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_da37198d7b514bf5887cbf23c5d05395.pdf?index=trueIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_e9108e93023745e28f380a2d5817595e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5216 bytes
SHA-256: 2342865914c958187f68ba41dff6f615c4e90d4db67de2bed369d8776f173f97
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10832 bytes
SHA-256: 16ea0eb28d68d999f414c7638b8c374bc08df991010b968f2bcf28708ae6730e

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