Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11f136e92e287a5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 08:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a05572e23fcfec109ff53603a127660 SHA-1: 91088adb14d5e13c902b9daf45349974bcea4e83 SHA-256: e11f136e92e287a5e6b654db154121bd311aef8fe647000f5f3cf056c8931a1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=clash+of+clans+hack+direct+download PDF link annotation
    • http://condominiobrisasdelnorte.com/userfiles/file/lujota.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/71402073522.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/44257925203.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/63440925684.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ae9c296d---92829377486.pdfIn PDF document text
    • http://iknow.pl/files/file/5200037744.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/gudazetuvota.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kivupufega.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161319cc414663---77909745931.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/61435868698.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/16671289080.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/70202451056.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/togugekatuzofilot.pdfIn PDF document text
    • https://renetravel.ro/images/files/73731837056.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/10003098984.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/10589167766.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/62801205397.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/11636003557.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/66277154724.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/72791189976.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/13892457339.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/62640003689.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/jopafuveresomoxasi.pdfIn PDF document text
    • http://houselandia.ru/files/monawalukobobuja.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/xepadupiwepevem.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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 18088 bytes
SHA-256: abc5177c9f8b85a035e119018f1c694ccf78b2423166164ffa90cb58c669631c
font_02_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 10784 bytes
SHA-256: 9b342a008552855df1199dd05a67c03220c694ade62baae809bdfaefaf3f4c08