Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8a7855e23a473c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 12:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d01137a9ba4400908a67da8d5fc1c677 SHA-1: 0138774a458e9acc1d2edd30a32b04d13633dc6a SHA-256: ed8a7855e23a473c6ee3fb210006b030fc2474f9919c1e40c25fca7a91cdf2ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=paw+patrol+the+new+movie PDF link annotation
    • http://muzycznescyzoryki.pl/userfiles/file/83019940688.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/86462168381.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/fanatexemetazanapovin.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tewuxujudalisupubo.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/99845174875.pdfIn PDF document text
    • https://ip-pharma.net/data/files/63623751755.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/50082051066.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/34999048195.pdfIn PDF document text
    • https://12tiga.com/contents/files/51923147660.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/sedifimijitelimemomepe.pdfIn PDF document text
    • http://mc-opony.pl/files/file/logefatikotibaduzeji.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613082985b244---35144537662.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613d575f64d07.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/muwus.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/95546827981.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/69445982830.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109241242594853.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/lumeladiv.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/94838407743.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/54849727388.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/c5btq261q79k81b51v9heogi47/90464905578.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_off0000ad02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 16948 bytes
SHA-256: 2b4d3ac2861d56b35ec34b1e22cf7d8135598e45b9d3bcc34e64a5c8704b02e4
font_02_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 10504 bytes
SHA-256: 4dfd117c8970bcd978e558263704e9aef77f9dd4457993115c5ba08394073e4e

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