Malicious PDF — malware analysis report

Static analysis result for SHA-256 2561e46b2e7068fe…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 22:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e263388e7b7a50af4295aaeb160de3dd SHA-1: a92ce0b2e3749b8210558e7725536f638decfe1f SHA-256: 2561e46b2e7068fe30a58a9eef0ac667ee2de663911856043241f6fad865a020
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document's structure as a deceptive link farm, aiming to trick users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://africanhairbraidingsalon.com/userfiles/file/66957679343.pdf In PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/83447001019.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902001316864375.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb5c6409---tiduxenudodipoje.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/bakasagozimarixivis.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/34264161161.pdfIn PDF document text
    • http://strap.sk/uploads/file/mowotavikifebikijevuromu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kadas.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/jitozodexagoxa.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/10353542659.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415666dc1b---67077201466.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/lotapes.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/lolewigagoxar.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/12458386769.pdfIn PDF document text
    • https://autoskola-scp.com/files/99296736477.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/bewanafuzibul.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zagufunofodelefuwa.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/67398580658.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/70025148889.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/pipijefatijoterunu.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/50645174491.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/55955953463.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/65524004015.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109070423554878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+mod+apk+betaPDF 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_off0000c41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 17292 bytes
SHA-256: d1edd0a33700871948f0d1ab3890908fd2319ee5017d65f24c222e0e126d3817
font_02_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 10792 bytes
SHA-256: e76f6ba9e33e1ce6a976ad962891a9071a4848c4eb84a0848bbf7461784ddb8b