Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6e1eababa8505b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 10:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f8c2e92549dd378f80483392eac99f4 SHA-1: 36990d4569d65dab639e7fb5a0106e43b6e152bc SHA-256: cf6e1eababa8505b6f4df914b200b4fb7ec0c5d146e4549f132ba1d9f12587f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/vajuxitazel.pdf In PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1f8f9843676acc096278b223de483a6b/kigogavixikan.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/wozufipozamisijodizaw.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210919180650.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/46222099653.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/43908150096.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e030eaa05a7c19614b2ca98181b02fa0/kogapojapilazob.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/12578012627.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/76448168011.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tefuji.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/pazizomafe.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/90232617992.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/75364465382.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/luwajixibepukapexule.pdfIn PDF document text
    • http://princeverma.in/uploads/files/jawubugudipisatavokufewe.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/1488479953.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fegilivejolakesimamo.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/82024982063.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219141446127485.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/34012514575.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/tunekineso.pdfIn PDF document text
    • http://wernitznigg.at/files/midijekebu.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/64237715438.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/porajeluzedivamesap.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/funoparuvub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lego+dc+super+villains+ppssppPDF 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_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 10712 bytes
SHA-256: 4f34a53871adadab1b736714314fe9a0b3eaf89863e4616c8f22e2ea444460e7
font_01_sfnt_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 16856 bytes
SHA-256: 777ee9650b4b98c7ff459e1df234e5fa005fdadfecccce63f6e77cfa0585909b
font_02_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1