Malicious PDF — malware analysis report

Static analysis result for SHA-256 596aa5f69108f2c9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 14:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8015c950d831adc1c5114ddd3ab16326 SHA-1: f54187d27d8436f6d05e6cf77025fe78c4778d92 SHA-256: 596aa5f69108f2c90a836687cfebb7ca87a74f61f7789b4bc2d4acb6ce8b2769
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript points to its use in executing malicious actions, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=monster+manual+5e+pdf PDF link annotation
    • http://mbjarrahi.com/UploadedFiles/New/file/madit.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/33821714535.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/80166004334.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/fatizizaraxijeluxeb.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/60676817780.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/65550221038.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/wototimukako.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/28838948777.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/76797076234.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613446246aa3a---lalufidekiditatedilo.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/36559859640.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/62859735834.pdfIn PDF document text
    • http://sartor.ru/upload/files/kagijebeworutoxubor.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/25767599302.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/32380612414.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce5407fc6---15385242482.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/87095378346.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/34013737793.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/12792428584.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/86897287667.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mabozawizexa.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/tofezijakuvonixemugo.pdfIn PDF document text
    • 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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 10792 bytes
SHA-256: 86fb8c6bd38c585ff0f5851005752ddd5899ea0c4216bd30f021a490da7887d6
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 18300 bytes
SHA-256: eb3d71383fab6bb36eb55e69cc7b2a409a6fe655a67a4f0fb20565359980c4ee