Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c851e874907c664…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 17:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4936b326284d8116536a0d1bca4ef1e6 SHA-1: db80084c36b561dde6c97edbc150cf77b8ed7d0e SHA-256: 3c851e874907c6648b68db31b9b0ae3ce89b774ca9c2c3b058780a06a5a7be00
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan behavior. It contains a link farm with numerous URLs, many of which are hosted on potentially disposable domains, suggesting an attempt to obscure the true destination or host a variety of malicious payloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stormester.no/files/file/junuga.pdf In PDF document text
    • https://alves.bg/ckfinder/userfiles/files/13195616177.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/93782427924.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/poposerad.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/54718214060.pdfIn PDF document text
    • http://www.polni.si/Images/files/wejex.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/46569929671.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/wariwaveziku.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/63210178751.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/rasumazavukikixukopudabe.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/55930475266.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/16862612018.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/jedoxevegubinusa.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/12557123794.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/zipoxokevaf.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/novevesejaxesipaviwitowa.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/82019844327.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/72943773699.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/41198179001.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/woriralegiwevarogoseweme.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kevobevokuxujurudiwazad.pdfIn PDF document text
    • http://sswjeans.com/files/genetemafamuvanim.pdfIn PDF document text
    • https://mimpidia.com/contents/files/6462430803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=seus+shaders+1.16+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 17088 bytes
SHA-256: 7678cd3abe3533c7c183b9110c52923fd89e15107db11e4c721f2e09d3235506
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 10664 bytes
SHA-256: 3b6c409396932c67a0fa9c7b11fa041fbc7ac91416e8a2340e4263caf2430b85
font_02_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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