Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa45abdf028466d…

MALICIOUS

PDF

81.8 KB Created: 2021-02-12 16:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 00b28599fa692d87b079b2026ca3112c SHA-1: a8914d53e9af819a74caeb872cb3a89deb8cb7df SHA-256: 8fa45abdf028466d8351048733a514d2f33f6d1e3a57e772facbf0992708326a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'krunker.io unblocked games 77', suggesting a lure to a gaming-related website. The presence of numerous external links, including one pointing to 'maypoin.ru', indicates a likely attempt to redirect users to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=krunker.io+unblocked+games+77 PDF link annotation
    • https://cdn.sqhk.co/zawukomofise/f9hgchg/virtual_beggar_coin_glitch.pdfIn PDF document text
    • http://rekabiw.22web.org/assepsia_e_antissepsia_tcnicas_de_esterilizao.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413002/normal_6003c4db027b8.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/8578447.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/cQwVEqL/fakepijexadubepasoxosoli.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/jubidekiweva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427268/normal_5fcb0c70d2a50.pdfIn PDF document text
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/dizugeb-pudaxogatok-xaxogi-joxudakojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387806/normal_5fdf37cb25648.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/wiiYmid/radiant_heat_manifold_parts.pdfIn PDF document text
    • https://pefikasulanak.weebly.com/uploads/1/3/4/3/134350375/zavane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5ff3b3ceb006e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesijesule/17554039585.pdfIn PDF document text
    • http://serefelotu.epizy.com/69015586338.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/boi_bella_upgrade.pdfIn PDF document text
    • http://desiwafinu.epizy.com/podigepe.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/catchlight_brushes_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/jawilopanat.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/vajedibufogagarumaxitud.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/therein_lies_your_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/enfermedad_hemolitica_del_recien_nacido_fisiopatologia.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/viwixizagom.pdfIn PDF document text
    • http://zifasodokid.epizy.com/nds_emulator_roms.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_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 5544 bytes
SHA-256: 5e4f3eec3bc59cc1bda0d2a24176439c764b88c24a882c42f4c24671f1eb57ba
font_01_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 11320 bytes
SHA-256: 0d1215fed54ef5a3a7405b1332f62f152a3162ecff003947f88b8e10848bd921

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