Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ab72fd71f703f…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 01:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4442eb058148bdbfaa7bf7c3de994796 SHA-1: fe651f44ef8afc57b36280280351ff32c4fd5136 SHA-256: d23ab72fd71f703fe3d60d92d305eb0d3baec24a3c123f9b0b09e22f4371ceb9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is flagged by multiple heuristics as a phishing lure, including an image-only document with an action trigger. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URLs suggests an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://onderhoudnlgarantie.nl/upload/file/zodoremeboleturil.pdf In PDF document text
    • http://bjdfszwy.com/filespath/files/20210902220452.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905143312693353.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/3556310945.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/85248719913.pdfIn PDF document text
    • https://best-label.com/upload/files/kivipikewonizonowuminelop.pdfIn PDF document text
    • http://crediramasrl.it/public/file/16148009911.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/51883616356.pdfIn PDF document text
    • https://diphong.com/uploads/nonujoramojufowajileseno.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/67984128140.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woperuxijusikunopabuves.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614da4bee1193---67362233464.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/83977739776.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/40379734473.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/kizatizir.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/jazofixipalupo.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/99474253011.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/safokobonigumi.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/60784246520.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5sj8lld5801u3qihql51bph4ng/femuwemeses.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/sezizoj.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/lefojazimikesas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hp+android+kamera+bagus+murahPDF 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_off0000ad0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0A 14072 bytes
SHA-256: baa8e8e2f9fad90a4ee494b3e6fba37a0caed1d10ebf6cb785d39673cc0862a4
font_01_sfnt_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 11020 bytes
SHA-256: 02cdee3466fc79d2fa638331374563a684064d2511c3a4529ddcfea4e5d35b0f
font_02_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1