Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9aaac8b6d7f157…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 10:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48a2531fcc6548744a7fdd08c1ba74a6 SHA-1: 98c1779a09a307667edb1b90e2d097e1b7bc4995 SHA-256: 4b9aaac8b6d7f157d2015c3aeae7e5519892ac0c3531c12116a4166e139341a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable domains, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ajej.pretty-match.com/upload/files/46888507155.pdf In PDF document text
    • http://showpalmedical.com/userfiles/josebafijamutexepup.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911035755635052.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/jawatefoselikotuvunoso.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/59043092896.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec268635da---vakotuxurikupidunusarax.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090621482073499.pdfIn PDF document text
    • http://446888.top/userfiles/file/jepagakutabogag.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/4220048073.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/87856739153.pdfIn PDF document text
    • https://arendic.cl/files/manifutala.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/toxavuwob.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/jeruzudimitafelep.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/kutabafotomebusezatekexel.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/16107770830.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/femuzevejuvidix.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/40791256660.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/90949172880.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225c84a2ce---vufimubanixekev.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/nojeligodopewovotinawuxu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/bodubowanaxowawi.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/puzimetirekawuzozimap.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/71580372442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=piratebay+mirror+2021PDF 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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 18856 bytes
SHA-256: 9fe0cd1ebc354e1b477740dd2ae6ea08773c5f4daafcc4574345e4d86286ccfc
font_02_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 10500 bytes
SHA-256: 52b8f91d1ed9e6e2019ed808883cd6ed10cdd5acf64cf2899257765de66631b8

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