Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7becad4d63146c…

MALICIOUS

PDF

79.7 KB Created: 2021-04-18 06:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 77c9ed86970f75ba204264b739f6b028 SHA-1: 2ee527b487fdca0f13102bf1981bd1da2e5bc18e SHA-256: 6c7becad4d63146cb41b515955d914932c0a65ebb57434b60d9bb9ceac01d30e
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The 'SE_INVOICE_LURE' heuristic further suggests the document's content is designed to trick the user into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=vedic+astrology+birth+chart+nakshatra PDF link annotation
    • https://rumorima.weebly.com/uploads/1/3/4/3/134307849/todefisobedol.pdfIn PDF document text
    • http://inter-kalinka.ru/29695771939iknsv.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/hbcsigj/interstellar_black_hole_rendering_time.pdfIn PDF document text
    • https://sigoxavofilaza.weebly.com/uploads/1/3/4/6/134697452/bd932c0c30632.pdfIn PDF document text
    • https://bisenazogogo.weebly.com/uploads/1/3/4/6/134686343/9921275.pdfIn PDF document text
    • http://cesaregaspari.com/1783146873qsz20.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/ks0OhUt/65375889594.pdfIn PDF document text
    • https://deserekinubolid.weebly.com/uploads/1/3/4/3/134319780/zodibija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://takugiwem.rf.gd/arte_de_la_guerra_sun_tzu_resumen_por_capitulos.pdfIn PDF document text
    • http://govakuvi.epizy.com/acting_for_animators_4.pdfIn PDF document text
    • http://tefotifomasun.epizy.com/14402602808.pdfIn PDF document text
    • http://nimobavaze.epizy.com/42851948188.pdfIn PDF document text
    • http://zajaduluf.epizy.com/febatoxopivosamom.pdfIn PDF document text
    • http://mazogatu.epizy.com/dungeons_and_dragons_manual_online.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_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 5472 bytes
SHA-256: e47fe6eb6983a2493024451ca465ca64059575ff084e9d84401af0b7a2503181
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 10856 bytes
SHA-256: 3fa3a35d848b0e0e15b0e3f603a6e43746922179979d26e6fe8f86de1f73301c

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