Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0982ddc1b5330ca…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 01:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efc7c050032f950d758d0b85ef58ce12 SHA-1: 5b4a76aaa5cd4ef86513c02684e78de446a5e2cf SHA-256: c0982ddc1b5330ca57e6f27b65447bede8800fe622457ac43e1b5f8c0a3a7da4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to external resources, many of which are structured as link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=vlc+android+playlist PDF link annotation
    • http://llux.vn/uploads/files/70333537825.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/20883176573.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/selilususi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kelodovoxox.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3b532f5844b1bc6737638450a0ca03b9/laxefoz.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/xoxuliza.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219410483323.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/movuvamobuvimewelinek.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xofuwukub.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/vabupugam.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909203730.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/vopelevowiborer.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/xezuzebexetupitowilu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613836f575196---72990266842.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/welobafisifiloweridir.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jalivavis.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/26744864375.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/81993904843.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/gojipirizedovolaz.pdfIn PDF document text
    • http://innersolutions-uk.com/file/busaxewel.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210910105134.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/27530827934.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/46887177912.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pilejawitowiruvoxuji.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_661F4E7D750F252C.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_off0000c6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AF 17880 bytes
SHA-256: 7f9717a4c4f4d681901e951e75fdbf7ccf025d5f8e34b91cb9c1c0f3b5330c4a
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 10456 bytes
SHA-256: 10bc3db9662190253d18652e884556d5fe979b79131d89e04391b2cfd89b6894
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1