Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba1893948004261…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 05:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4c5fee041994cd7f181b91e521986eda SHA-1: 3bf59f2618914b13f031d7a29991ff13fb1c29d4 SHA-256: 1ba1893948004261ae0e88fda1889ea308e4f995bc0d95ae67f7cb1a6c8e81ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links hosted on various domains, many of which are likely disposable, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://desco.scp.hr/files/25398895326.pdf In PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/kaporuzenotorofozikanux.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/84841838483.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/37668069578.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210912103702.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/webabovub.pdfIn PDF document text
    • http://pjteam.hu/uploads/jinelajiwikuzepokubirin.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/deratetabe.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/nefileput.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jumefujakutar.pdfIn PDF document text
    • http://skomi.ru/img/files/file/zisidofujatuzowek.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/tozekigizepogamuxu.pdfIn PDF document text
    • https://mangallagn.com/images/file/punomuxisizejaruwetosi.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210908205303.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xijowitezowatasuzup.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/88466733626.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/13634085562.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/89845529450.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/87950047005.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/2163862799.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/93271557623.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/66406030847.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/24105741877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=detect+spy+software+on+androidPDF 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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 17140 bytes
SHA-256: bc25e1222f475955d09ab60885d1489ca481b35770192dc51f751bf20635434b
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 10768 bytes
SHA-256: c508bf9328ae42c852064f7b920940ae996f158186accd69054d2f1c69608548
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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