Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cd51def13dfacd…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 18:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5b2a23bd2c3ee99249f264758964799 SHA-1: 94833dc3012dc3ed65877f644c3d3f805ca7db23 SHA-256: 55cd51def13dfacdb2b780ca63c7823fbc2d538dfaff1551b52600d99b15a564
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/strik?utm_term=how+to+factory+reset+iphone+6+plus+without+password PDF link annotation
    • http://dexuposi.sportsontheweb.net/98421288937.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/gejadevife.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/best_vegetarian_sources_of_protein_india.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/cezar_roberto_bitencourt_manual_de_direito_penal.pdfIn PDF document text
    • http://bloodcraft.online/9-3_practice_rotations_worksheet_answersn14qh.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/nozik.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/fulaxu.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/xekofujejox-nupefisa-zilape-veporubejerizix.pdfIn PDF document text
    • https://zuzidoparifiga.weebly.com/uploads/1/3/5/3/135302874/welurufevaboxumomexa.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/gisobavijiteri.pdfIn PDF document text
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/4572628.pdfIn PDF document text
    • http://grusha.space/584902584675cp0v.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/caballo_de_troya_saga_completa.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
    • http://weralawubuzeg.epizy.com/widukud.pdfIn PDF document text
    • http://pijosufun.myartsonline.com/77159779148.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/53278947510.pdfIn PDF document text
    • http://mafikaxavetubod.rf.gd/60698818454.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 5432 bytes
SHA-256: d5f1ec4f88cd25f2fabab507af08e303bac6744cb699157be78121fcb8540c1c
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 10672 bytes
SHA-256: f40434e52675ee9efd5c5bb34a13fbd9870abd7cac7a69230bc0c6e26554c6cd
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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