Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72ef9693c30f6e1…

MALICIOUS

PDF

87.7 KB Created: 2021-09-24 05:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f3d6382166254912986b25bc0af9060 SHA-1: a9b6909b04ec64fdf7dc955f72ca4f295bf5f8c6 SHA-256: a72ef9693c30f6e1cb5b88a61b03d0e2d663a8dc5f2236b4799164b359777ace
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable or unknown domains, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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 http://ellev.fr/upload/files/zamiletazinufukal.pdf In PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/vosenobekewij.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/95824028504.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/jiluri.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/44091235100.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-20/20210920201408521431.pdfIn PDF document text
    • http://kammed.com/userfiles/file/bupubipu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d210b68827---witoxurizar.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/telanisibuzogasi.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/31039593751.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/wofulikofi.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/30099373745.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hofhprknkdd0t7dmjbt4cbus4b/38882550454.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/76002115933.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/65001378066.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/dosil.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/xixotebogetivipivepeze.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/c3d98e.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/favikusekifol.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/jetamomugiroda.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/19057804200.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/puzof.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/53990155681.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/76753464440.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kedibomawupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mr+inbetween+putlockerPDF 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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 10448 bytes
SHA-256: 7b77a8a4cbb5b5e2983eca8a9cc5263b257d8d8265edb57a8d328661eb87ccc3
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 19420 bytes
SHA-256: 0847e274a759a2f206d0d0fbe03a879e18bf730dc6e25d2d1fc111e9519a5eb5

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