Malicious PDF — malware analysis report

Static analysis result for SHA-256 29df5b1c92cc8606…

MALICIOUS

PDF

68.0 KB Created: 2021-09-19 13:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6acc7fb900ec7da5bfcb26816e410f44 SHA-1: c63d7c3e7faf57131c66e4e419bf4804b43a746c SHA-256: 29df5b1c92cc8606df33bee3ff9e1b9e66cba0e889649f53d1297e0421817571
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document structure and heuristics indicate it's an image-based lure designed to trick users into clicking external URIs, likely for phishing or to download a second-stage payload. The embedded JavaScript is likely responsible for executing the malicious action or redirecting the user to one of the numerous listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://archism.ru/uplcv?utm_term=android+image+editor+layers PDF link annotation
    • http://shqinze.net/admin/upimg/file///xipejakolab.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/kuvopo.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/98339912037.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/saxofotorixesosarilad.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/dogosabopubisejasa.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/sebupatusavuf.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/sobipamigojurowugemazoje.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/30955122830.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913023437.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/36379114150.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/jexuwevejikiba.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5097460691.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/84631906238.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/dikuneduwezifelus.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/1049157174.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/43141040351.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4b9db9c1---92131053267.pdfIn PDF document text
    • http://chikatere.com/Upload/files/40511348284.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16145ae0c82e16---tisesuxuwupifadelen.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/75602939787.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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 13800 bytes
SHA-256: 6c944a4208db3dd1e72339c6007808f15707634f4ef19e4ef53b4b641337cc67
font_01_sfnt_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 10688 bytes
SHA-256: 0bc4641f96f6eeb1ec8308355608944ce8c2a61f214ea916a3406026648586fc