Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a8c1574e133f71…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 07:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cdfc6ce70dcdef517d1492ecd6b7e122 SHA-1: a77bbf6e9abecc460df36b69a382c853015a47ef SHA-256: 49a8c1574e133f7190acefb38fbdbba3dd639034ae86002dc605f815a5e6577e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a177e4a8d---tofanovowo.pdf In PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/jerawagefiwitivux.pdfIn PDF document text
    • http://it-hair.com/userfiles/20075706834.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/modufidamot.pdfIn PDF document text
    • http://benly-carson.com/product/files/winaluwarinoraboxejixugug.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/11640614043.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/lugemukodejumenuzetopik.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/tofalezidi.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909125008985796.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/67735318619.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/92945348430.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vevusezuwub.pdfIn PDF document text
    • http://sjanzee.nl/file/roguxobemapewikuvupizuz.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/31455416086.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/munixomeruvusafimanapi.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/71710592803.pdfIn PDF document text
    • http://canadianrockies.info/files/file/lavozapimenupanoleremu.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/15734260169.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/vitabadefegapa.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/61330485296.pdfIn PDF document text
    • https://vestol.bg/files/file/tiseder.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nmk1p9pnfq5djdojloo74g2lbu/41503803345.pdfIn PDF document text
    • http://dhf-china.com/d/files/25012638609.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/21425189796.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/sirokufasosuxijaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=123movies+frozen+iiPDF 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_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 17452 bytes
SHA-256: 7711861ee2a9fabed9b5fb6eb99c430714f44c1b5b8078f5dd2be636e6dd0fda
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10440 bytes
SHA-256: 7b92a9d331e72631f6a4f50a0a21bc1c31685b133fd9c36cd8202df340fb0fb5