Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a84b37f2285f134…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 19:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df1cd0e07e88ee97efccb780a097e7ee SHA-1: 221f72ffc01d3a7d1ebade3166510133ab3dfda2 SHA-256: 3a84b37f2285f134f1ef48d37fd70f1407e454f28604f60a71aeb5d58e761920
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=idle+car+dealer+mod+apk PDF link annotation
    • http://jar-ted.pl/file/bariwebenufudoredi.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/rexosenetomosoj.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/pupifamurujesezo.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/gaxadumek.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/88654567667.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/80590065557.pdfIn PDF document text
    • http://client.diffuse.info/files/40648035421.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26e91f4a3---69185742413.pdfIn PDF document text
    • https://profesa.net/userFilesfile/88980160516.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/30504769878.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01a1eee2348b3f25ea8d4d453cdb7719/kifin.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/60650088559.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jikidex.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/96340052087.pdfIn PDF document text
    • http://mayjack.com/upload/files/xupunasajafepup.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tuxatujeboboxaturogunid.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/8030937233.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/kavevajopitavalaritikofin.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/movomeje.pdfIn PDF document text
    • http://gensugroup.com/upload/files/57075908255.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/tilelugoniwamomi.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/vafajiwos.pdfIn PDF document text
    • http://moristas.com/userfiles/files/24739199387.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_off0000ae66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67D 10256 bytes
SHA-256: 021e7f27f0343483194cee9e7ff291ba935c4b376cf8e9650104da6696f6fa95
font_02_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 14668 bytes
SHA-256: 5520b00a51adac7cc4524662064f3a793ca4ff520be8360ad23383cfa5b01086

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