Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c653354a55bb4a6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 19:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 84bdf502d6f61ded37fc73c7ed511004 SHA-1: e85dad12f3b756bc80dbac582e878cbe64b34ce1 SHA-256: 6c653354a55bb4a677f1e26cdd50b993d0c854449cff733d8762867f65073aed
134 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. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=math+worksheets+for+grade+5+area+and+perimeter+word+problems PDF link annotation
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/41125630762.pdfIn PDF document text
    • http://trevorhannant.com/jutasumiborerufij.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/12690163738.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/54716827388.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/95792328523.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xixidolinoxex.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/45858656815.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/61568956687.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/joxuzalalosiwunafuzon.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/9306131998.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/nuwegewozofasubonojorune.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/48281811078.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/niduveratetage.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/kitibepazonawodebija.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/82509518445.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/50908675405.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/xuxikiz.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/91262691482.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nuzugebi.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/sagoxiremowudilisezu.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gotetifovonadurasazunu.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/60445824768.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/dovifufasev.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://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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 17972 bytes
SHA-256: b0aa5515c709bf3ed5607b18627b87a79b3d7e58058e9c596e8fdc3bb2950feb
font_02_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 11392 bytes
SHA-256: d21c15bc5ad524487b4649f4161fff1d2c25bd952d59422553d220b4d1e56d51

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