Malicious PDF — malware analysis report

Static analysis result for SHA-256 2955d0c85256fc4b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 01:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b333f272de4fb5900b9ec52b15284b3 SHA-1: 5b6d01a76fcd8b9b085bf6ec16a7b49b49ffcddc SHA-256: 2955d0c85256fc4b8e7f48f3051b644de34b5e64a0ffac3e0ac4146ce9d18483
166 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://huanghecables.com/d/files/60478874880.pdf In PDF document text
    • http://khamtribacninh.com/images/files/tidezarujikin.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/gupibimenibewopabesu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/wabewasebe.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/37450412517.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/kafuxisuvulipoxezite.pdfIn PDF document text
    • http://grotech.in/userfiles/file/jeweg.pdfIn PDF document text
    • http://client.diffuse.info/files/xawolakoriladojazero.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/fiwuwatewe.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/gosagesig.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109101827565870.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6623abd5ab4ba3e920a58a29e18dbadf/kufawutu.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/botokolatamiriwu.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/lumusulufona.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/lapif.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/wagonulokab.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/13626110091.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1ffb0108---miwidixe.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/penizogidosapunodosid.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/25306229323.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/13195359441.pdfIn PDF document text
    • http://teifsepahan.com/files/file/xenadixibibonaminogoxi.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/34203107374.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/riwulisifisejomalabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=grindr+premium+apk+2021PDF 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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 10648 bytes
SHA-256: ae77cd9a1c974dc47f986923174700f102651540592daea6f66cceb33c17bd36
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 18576 bytes
SHA-256: fe100edb057c6e37136433524032ce5bb8bdadb84bae77c2dd07c2e7447714fe