Malicious PDF — malware analysis report

Static analysis result for SHA-256 be674ae0860adbd5…

MALICIOUS

PDF

63.0 KB Created: 2021-03-03 07:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 13106559adab888143229aeb1004bd54 SHA-1: bbd51ba1d59deb1cbb0cefc1bb108a6384d2df1a SHA-256: be674ae0860adbd57987db81a3952cb6e6cbf993583fc5c73b0af1b9f1645a11
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to a medical device manual, likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=respironics+simplygo+portable+oxygen+concentrator+manual PDF link annotation
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/9049024.pdfIn PDF document text
    • http://soinjaga.ru/8132195258090oxb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_5fd3c1fe80576.pdfIn PDF document text
    • http://flymoney.net/inocencia_interrumpida_libro8pdjx.pdfIn PDF document text
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/672623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_602c1fa75531c.pdfIn PDF document text
    • http://vienvozvrat.site/289239507341ez9.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/fijojewureku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_6008e1deb6c65.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/7mhhiaL/lonigarokije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_600aa6e4ecd12.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/fia85Mr/iclub_manager_2_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/bHgjgdU/42750786907.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/nivivif_xaxuvatojojube.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/baposivarabuj/english_filipino_dictionary_innovative_software_apk.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_off0000bb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 5568 bytes
SHA-256: 9506dc6daa5370394a1820af1b6abc8e8a200667576e13bd19624bfc9b4ae882
font_01_sfnt_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 9612 bytes
SHA-256: 667b11cdb9b7244a1ed8837dac3d8bccff501b0813df3d861148abde8120a9bd

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