Malicious PDF — malware analysis report

Static analysis result for SHA-256 e155c98625c1ca11…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 04:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcfc750f2a9c51dfa26a2fc109def722 SHA-1: 1366381690a8518dca380755b02e740c240dd304 SHA-256: e155c98625c1ca11eef8ed5b0447149c5e894bb8312b56c3de653e172c2fd8d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely directing users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://brothers-music.com/ckfinder/userfiles/files/xefegivi.pdf In PDF document text
    • https://vsetinrally.cz/userfiles/file/jiwitoxudazujibo.pdfIn PDF document text
    • http://schokozentrale.de/idata/86990238817.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/gogadidomozuwototem.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/70383321790.pdfIn PDF document text
    • http://sinoorchids.com/image/file/nibavorarixononezupe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613363ad1efa3---14858029600.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/35337692760.pdfIn PDF document text
    • http://ruihuitax.com/files/file/46372535697.pdfIn PDF document text
    • http://sb-78.ru/files/file/jomaponokiripurogavew.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/51033816672.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/kegozizidebuxowegux.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/67761231366.pdfIn PDF document text
    • http://bptramptour.pl/files/file/siwokumivaribokitev.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/ligarowanamomazibaxepejob.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/78433450751.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/ronukomogowetazenonenena.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/wizekefamibo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/23095803893.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/wanegakupevuj.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/87359f1c0d63d52cb4c1110415db8c39/26817531790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=game+with+cheat+apkPDF 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_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 19312 bytes
SHA-256: 35be0322e67f1e95baedc86891ed25d1442a72776c2f485569b4ad46d87d4f0b
font_01_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 10316 bytes
SHA-256: a35f1cfa8cef6e1870b46f323e19f6c2fe4edf2359100b36fbf39c586ebf1cf4
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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