Malicious PDF — malware analysis report

Static analysis result for SHA-256 676510e931e4aacc…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 16:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6aeea83f773b02d872368f2db61aa28 SHA-1: e2d56cf15e1e6a7762eb5b272f0531c34335d0d3 SHA-256: 676510e931e4aacc90eea6a7ebd323101f156e85435f25d4258c2b15adb10e59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 https://0a3exp.com/upfiles/editor/files/95809929536.pdf In PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9868000577.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/77210867290.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wefofetavesimokakewuje.pdfIn PDF document text
    • https://viceda.com/userfiles/file/wewumadojuw.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/10662575122.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/40868161921.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/85776787310.pdfIn PDF document text
    • https://bloc-immo.com/images/temuwikexojikesej.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/pulifulomovo.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/29975787926.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132553d4e319---98967493068.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/balokulezagigeg.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/71658057950.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/19013873907.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/54976720246.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/niduroruwinoxub.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/92133900255.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/40123361507.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/40645454338.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/65810768261.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/24532826299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=imo+video+call+appPDF 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_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 10220 bytes
SHA-256: 9d0cd8558410b23c85386df89befa34ac3a8aace2251777a3c6c7ccd5b2f52b8
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 17300 bytes
SHA-256: 41a7db2945aaf425c9e2c133c5da77e2540a3df55881325e1ac8cd4be992b11d
font_02_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1