Malicious PDF — malware analysis report

Static analysis result for SHA-256 d380b534586de862…

MALICIOUS

PDF

91.2 KB Created: 2021-09-11 22:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 00f30445b6c31c80bfee4f7ee68826e2 SHA-1: 6bfff44b566b1e3c66c24d802fc98bc1ba108e4a SHA-256: d380b534586de8622bf616438616ab7c6a0be4429fe455b23ced04388c44a2ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The presence of external URIs and the link farm characteristic suggest an attempt to manipulate search engine results or redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing purpose.

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://kkc1.org/htdocs/cljr/data/files/61456274106.pdf In PDF document text
    • http://www.og2c.com/images/file/26901529871.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/tevaviburemovoduxolabilu.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/xiwivifarawike.pdfIn PDF document text
    • https://interconformity.ro/images/file/lolozilinok.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/8981585709.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/gasonubafopowipoxut.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/tafinetutob.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/31807795657.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/54192187176.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/31355406486.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/12259080096.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/zelelofinipeleruw.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0f70c3bf---52583206655.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/vexudepaligogutumapilaj.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/88154674762.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/79645852116.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/39494794701.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/66883940596.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc47bc3e59---74657818399.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/pitupuvimunokazina.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_E024136AABF5F36E.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/rixozev.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/loweponepa.pdfIn PDF document text
    • https://lasanisports.com/files/kuzulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=modern+combat+5+cheats+androidPDF 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_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 20228 bytes
SHA-256: 3e6ea4be5656cd7d7b20b483c4b54cac1f7334bcb2b9c054be672ec2f76cadf7
font_02_sfnt_off00014637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14637 10856 bytes
SHA-256: f6760202f27a0a6fb24551cdd738a96f75380b27ecf3712fd28321b508fa47f8