Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cdd78fa5f8857b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 04:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cb46cc91621d2d771747fdaf752ca7ee SHA-1: efc5ec2fb7fdb89e2fddfdc9f6fb138bde1b749e SHA-256: 19cdd78fa5f8857b6558c768469bc7ddee51ef1083446ab3b58e7d2a930a87fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs pointing to potentially malicious content or phishing sites. The presence of external URIs and a link farm structure suggests the primary goal is to redirect users to compromised or malicious web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=weed+firm+apk PDF link annotation
    • http://thuexe7cho.vn/upload/files/3666979778.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/3137710266.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/97401440317.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c8a6a09a---85195461439.pdfIn PDF document text
    • http://leskovec.eu/files/file/binugesuvelodifapuzif.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixijikatoxuposudupotegos.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/64823832940.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/visalojit.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/75128940350.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/digelipuvuxudujisebidatab.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910181926.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b8db465a9ffbf2dabb6aeccb764198c8/58510108953.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/359172244.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/setakegifuxepixixe.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/13359915417.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/79438796732.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/sibomolidoxexodafitufokos.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/domigu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/53423640949.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/79386101856.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/mozutibizuxeko.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/53828864193.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/xiguvidepaxelaluwu.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/31502621304.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_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 17500 bytes
SHA-256: 328525d8210cc4fbd23a052864865f19f946a10e6e4138af285f88d9faf2e5cd
font_02_sfnt_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 10208 bytes
SHA-256: 2957f3342c3b6a64fe1b9e288fd74e2600ec5df46d12144632fa509ef32bb8cb