Malicious PDF — malware analysis report

Static analysis result for SHA-256 23567dcac09327e6…

MALICIOUS

PDF

68.1 KB Created: 2021-10-04 08:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9b7403796adaae58622e6a4e14b0736f SHA-1: a1a5cdd3ccf3d66dde78d00333a5aece8c2661f1 SHA-256: 23567dcac09327e64abddcc74a800d3f58dc500a0312428d296e0af621cf9240
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a strategy to obscure the true destination of the links. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=tubular+bind+off+in+the+round PDF link annotation
    • http://www.egavilanes.com/ckfinder/userfiles/files/12488617465.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/41193618621.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/24938002069.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210928024316.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/rumevemetozipimegaz.pdfIn PDF document text
    • https://chp-travel.ir/data/file/valeselubugiwofo.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/gizatifexifavavobevu.pdfIn PDF document text
    • http://pinxedien.net/upload/files/xamasojedif.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/36572390010.pdfIn PDF document text
    • https://atiksigorta.com/files/65369713718.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/79005728405.pdfIn PDF document text
    • https://preciseenergygroup.com/media/71627754227.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/xepejafuritewagirelagu.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/96844377011.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/59609646982.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d00b27cf4d9b8c90b386263ffdc9fc0f/gelesututumofonidole.pdfIn PDF document text
    • http://moristas.com/userfiles/files/lufuxunibukisonidupebin.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/79128749376.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/bulodarisigu.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/vonazolamekex.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/mifezaf.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/84588211052.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/85222067216.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/23564579147.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/rosegevawevelud.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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 10488 bytes
SHA-256: 8a19be6229ae9271caa2aba6e77d4987701da8385d90e29a6e4bb399f76f8903
font_01_sfnt_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 14376 bytes
SHA-256: 4817580f0a7fddcfc62afad9e943af4d44b44e38a0ed5abd7d22c8f45bbf24c9