Malicious PDF — malware analysis report

Static analysis result for SHA-256 7110a8d1ffdd2c3b…

MALICIOUS

PDF

91.2 KB Created: 2021-10-07 21:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5b35814d29b49e583500e9b6731c8c6c SHA-1: e162b6350fcf9cd6dec6e30b7bd8dc0c61f7b038 SHA-256: 7110a8d1ffdd2c3bfcc489cf9fef5cc5e3a58db21fcf93deb1e38f9b7fdd609c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with a high heuristic score for being a PDF link farm on disposable hosting. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. The 'wkhtmltopdf' metadata indicates it was generated by a tool, often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crewmak.ru/uplcv?utm_term=the+gene+autry+show PDF link annotation
    • http://getsolarnj.com/userfiles/file/rumumidebajunupuj.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/lukiduvi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d5a6677b98da56ab37f4b21109d0009b/93969973878.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/legidelafobija.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/bibiparijasebifizevigonam.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/55580496226.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/tifuloraxijubavenoxi.pdfIn PDF document text
    • http://aweibel.com/Photo/file/16206638149.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/zonizobulexuzatageva.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/valem.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/79929233736.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/84947769730.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ranibowafafemegilaw.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/97bacb17f283d468a3c3f7c323cd7be8/danimirexavoluwuzararatuk.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/96666394896.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/bofuse.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/70258556922.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/dimidevinapozegidovido.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20211004054414.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/gepaberoloxobobim.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/susimiruba.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/84247340056.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/bezekexevafona.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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 21360 bytes
SHA-256: aadcf835cf3bd22eaf6aeb1e2d52dabfc8640341315dc573f17fd444e5aad7d8
font_02_sfnt_off00014752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14752 10512 bytes
SHA-256: 4216c3b55f635f5d3290c16e413c1bbc255edcbafc50185a2a39c67128a8685e