Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be5aeabe5cdd29b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 16:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ddc470afdec4f2e1385ae56a5cf4c203 SHA-1: 024712b70190170c226b11cbc11d84a43084ab4f SHA-256: 0be5aeabe5cdd29b965f0a0873b10246f55849f5bbadab0c7e4573520a402d78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://szolnokepul.hu/userfiles/file/71041800258.pdf In PDF document text
    • http://elijasprojekts.lv/files/file/xafutisamazugifiw.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81618129923.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/megavasubolimatalusufub.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/6082524079.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wudemumun.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/71488472178.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/87475333174.pdfIn PDF document text
    • http://medi-sen.com/files/files/fopofamadupir.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/leginufirunenovasegabumo.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/febugozomivawufitusobuna.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/lekexumixapu.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jijug.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/nifepovunoluraj.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/tazagowokoduxaxanadu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136909eb9d95---60431704233.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/14729841793.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/61952677303.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/43139292648.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/91589304565.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210912_A3790CA83A57F82B.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/gijokelipidaponezigitesu.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109162150268477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=every+inch+of+my+love+led+zeppelinPDF 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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 16684 bytes
SHA-256: e159ae39c0c5dcd9615909409ad302e952ddb33f61d8f3bf5ea70dfd69fb1c30
font_02_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10680 bytes
SHA-256: 8a20b06e3723b658b4699d1fb2045080166ea1949e58a679733cdc27850adb47