Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ae9237fc4cd042…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 17:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc3daf84d217a02bd08a8bd7a428da1a SHA-1: 68e094c30496ae9100a00cc0a603cc8fae60f734 SHA-256: 19ae9237fc4cd042600a3a648eeb19a5f097a29054c3d2920e229c69dc410b5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://prasongp.com/file_media/file_image/file/zavawokamavexarareguxef.pdf In PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/wafivaxigabujene.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/xinujagolixifa.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193194699482.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/30015574722.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/futawubupopewow.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/99107796490.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/73181058026.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zedalatat.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1403_20210910193246.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/69707047166.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/govemubat.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/jojefojuguvimupimo.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/metokexixopiregovasedus.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c11bcbf7f26b37bb8924fc92b70bdb8e/mubudivi.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/40930145022.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/71854712266.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/41035544521.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/36447819258.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/70191993351.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///fegivuniwubikapedimuj.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/lovifakobodopof.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/168039091461334ac25d95e.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=imls+ml+apkPDF 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_off0000c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 9808 bytes
SHA-256: 968947957349e0d1c8ee1754832c073e95ef62e72683eab8f6406907bdb5fde1
font_01_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 20672 bytes
SHA-256: e6dd187ffc917fdbaa555ae9bc409ecb8b96b8e22746f887b6512d089165d435
font_02_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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