Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17eec34602a3ddd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 17:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce31b18c4d9733e03854c9d3af4d5cb9 SHA-1: dc363e944e56bd7def2a4e3d3f5fe69b1e2bf05d SHA-256: c17eec34602a3dddfd0b0eca079d0ce5d5dbd336e699425fd6c6c8f6f7cd12c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=historia+de+la+seguridad+industrial+pdf PDF link annotation
    • http://lifecare4all.com/upload/files/vuwex.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/nisavefedutatalim.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/01/file/nidepeze.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/rizipulirezazukiwudej.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/rokukerakusewexovezugoki.pdfIn PDF document text
    • https://langumeistras.lt/i/File/palabijogox.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210913/210913191039164741jjfexhjkkshx.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ebb435fe5---fanok.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/91074421504.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/kimawifenojelisu.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/matusalixigenopo.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/lewerovefoxanelubo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/17625157617.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/satimumegowujaj.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/juzusiketogezojekenepure.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/sifunugojegeve.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zudupexajulo.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/30127313584.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/2484801102.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/papolebutuwixoloveme.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/xupopanonejelubedo.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/73860162778.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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 18472 bytes
SHA-256: da63c890dfc8872b510033174b23671fb77e417fb0a0b72be4a5f2e36d5d471b
font_02_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 10764 bytes
SHA-256: 56828cf89b27ab2eda99fdbad0ed89cb7369521b22282a8d6eb806c193934578

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