Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94919b24e86bf5f…

MALICIOUS

PDF

75.1 KB Created: 2021-03-20 05:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d8b3ced2550fb93a45b394b49268779f SHA-1: b71df894c9e3243f4bdb1b47d919f0daffe92d19 SHA-256: b94919b24e86bf5f8d20fefa0a8c7cec5f0491507c35f89c106f64646b7669ad
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malware or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fokemale.ru/123?utm_term=fundamentals+of+accounting+pdf+free PDF link annotation
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/c8e405.pdfIn PDF document text
    • https://widijusadapabi.weebly.com/uploads/1/3/0/9/130969823/nenebavor_dedamevenikib_bexugiwe_jawewulikux.pdfIn PDF document text
    • http://jolaxamitagifa.iblogger.org/36538754160.pdfIn PDF document text
    • http://jushq.club/14684098637vrguc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_6025a961e7b3b.pdfIn PDF document text
    • http://afracheat5.xyz/epson_wf-7510_wireless_setupw8e0c.pdfIn PDF document text
    • http://lizubujakus.22web.org/antepartum_haemorrhage_green-_top_guideline_no._63.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/xolagaperulojenupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60368499a2522.pdfIn PDF document text
    • https://vidanametok.weebly.com/uploads/1/3/4/3/134318125/tivesutevu_berumazaxevasix_nivusuzotar.pdfIn PDF document text
    • https://zefutijokizire.weebly.com/uploads/1/3/4/8/134868110/puxoforaked_mudem.pdfIn PDF document text
    • http://repochka.site/libros_de_ingles_basico_para_niosuomh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_603fe375abfcc.pdfIn PDF document text
    • http://wegansit.space/26950746380g1agg.pdfIn PDF document text
    • http://retys.space/samsung_rfg297hdrs_service_manualwrw4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_60209d0960cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fd67bfcb6f3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panenaba.rf.gd/koxesuxujarelosovefuzofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e005ec-fd9b-4634-a968-6752cdb1cb38/piwefebun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8423c150-b3e0-4bf1-91e6-cf8b37ed489a/35102434871.pdfIn PDF document text
    • http://rawatakutuju.rf.gd/nevisiraxegekukowi.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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 5432 bytes
SHA-256: e234b18ecc333479046c004c4b894fd69b39c27d388b72bc24a269217d38322c
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 10972 bytes
SHA-256: 9072ee07e23029ef2a1611bf6a773a00400b3fa731e7b3723690ec00d102d536

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