Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffc991a655bbaac…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 19:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 23f6d065025c4963167dc6ca6e406434 SHA-1: 1988a8c2f04a43978d151a5e19c466da098ea887 SHA-256: 5ffc991a655bbaac3903b1ace6caba61c5d09f99fb9c5a282be0317de717f128
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://mail-business.ru/uploads/file/24066178310.pdf In PDF document text
    • http://orthopediedelft.eu/files/76591413922.pdfIn PDF document text
    • http://termocity.by/pics/files/7852821043.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lorusole.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/denekekiruta.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/belizobaratodadezi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/woteponupok.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/13158a0a2e513c320f8c4ad202c72a72/dituxumulizisuv.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/mubixujufumatisi.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/26771312555.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/sadogalojatorami.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/purusezoxasef.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/zapobazuj.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/14437798332.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/maxupufowet.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/44278385316.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/gibavufawupij.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/nololigudini.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/84919618294.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/wanajupimerovibifaxa.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/96198946145.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/jajozopedaf.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/suvewenon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=i+love+my+pdf+merge+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 17416 bytes
SHA-256: d72267d70e8a34fd252fa66f7f8f74fcbd155a913ab203c252115c7431cdf4f4
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 10348 bytes
SHA-256: d1902c457ce219361f69bcd46cddc6575def3d09cbcd2045c533470a05876621

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