Malicious PDF — malware analysis report

Static analysis result for SHA-256 898e697fac0a81f4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 14:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 921858177f5a3a68d933bd37e197dc87 SHA-1: f84e76ada998ac74d8cc8473e6796b43bc5b6a56 SHA-256: 898e697fac0a81f468f5e74dcfeb0ccd2d2d3b82c94f821f5a85167cd260231c
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's an image-only document with an action trigger, typical of phishing lures that hide clickable buttons. The embedded JavaScript likely facilitates the malicious activity, such as downloading a second-stage payload or redirecting to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 68 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 http://profil-metall.de/content/uploads/file/mesorinisujara.pdf In PDF document text
    • http://sor1310.com/userfiles/file/wofifuma.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/vogugarumumoruratuwomak.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/82960994722.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/mepevutemumedan.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/murimamip.pdfIn PDF document text
    • http://client.diffuse.info/files/99877207497.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/7332511665.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/50331962410.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/599843607.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e263dceb2a483a5e68280711965e05f5/debakusubi.pdfIn PDF document text
    • http://ducnhua.com/upload/files/jadizudipotasimoviraref.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1632359621.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/wenerujaxujineritilisum.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/kadasitixed.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/92554541831.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/21753221044.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/notivadapadiwurukawavozo.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/15972932860.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-23/20210923203723695753.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/22010318815.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/53789193698.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/32729090543.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161362cf1b54ba---dawavefaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stick+war+legacy+mod+apk+hack+download+freePDF 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_off0000ae6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6D 11264 bytes
SHA-256: 25dfdfa1bf7d12dda1379fd840d3dedc7d97ee27fadc4c5b46dc6f077e6efcaa
font_01_sfnt_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 13940 bytes
SHA-256: 7a43dc79b75f35357900ed64a9f44a4e7aca74c56d7697a922a7d4bb8ff36416