Malicious PDF — malware analysis report

Static analysis result for SHA-256 508e1cfe4b8bd7dc…

MALICIOUS

PDF

74.3 KB Created: 2021-04-25 23:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 95ef5cd60ab4a88aa40ef9f2e3b48173 SHA-1: 75c3311a1667874c42518f1a1fb9aa41a4897528 SHA-256: 508e1cfe4b8bd7dc5e1b9d2f80a8476fd260060530109a147088c50f28d197b2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'grammar english to spanish' and 'wkhtmltopdf', hinting at a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/strik?utm_term=grammar+english+to+spanish PDF link annotation
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/wukuziloweg-walanivepitolu-sedote-melulesunamez.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuwitide/jjhfLji/xudinemawipu.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/qOjgHAO/cloudformation_vpc_ec2_instance_template.pdfIn PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/fabuwija-dimajo.pdfIn PDF document text
    • http://xegexar.iblogger.org/93975714043.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/ighejaq/91427756657.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/8xjbeic/55287200336.pdfIn PDF document text
    • http://xalapuzim.sportsontheweb.net/23439435647.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/neil_gaiman_quotes_about_libraries.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/jhjfZRa/burger_time_69_menu_prices.pdfIn PDF document text
    • http://penoligis.22web.org/american_gastroenterological_association_ulcerative_colitis_guidelines.pdfIn PDF document text
    • https://rofotemajanati.weebly.com/uploads/1/3/4/4/134497193/1298357.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/gcACljg/6960105152.pdfIn PDF document text
    • http://wodidovurezugeg.22web.org/5288492787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakepusigazu.epizy.com/tipenidisotonalutofux.pdfIn PDF document text
    • http://warejuratunu.rf.gd/xejafitasezu.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_910c94ec6ef5475ba6f70dc77a2562ba.pdf?index=trueIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_37798c4f3ca84639ae9258350cfea3fa.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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 5264 bytes
SHA-256: ba36f8c245e7451733dcbbc115ed04b661728b143907bbe0c201d2fdfec1c0cb
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 11064 bytes
SHA-256: e0649fc4b93eceb6d4a6f6f8ab8599d53ec395eb4cd02f7e50f62bd2a27b6fd7

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