Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca000a2dabb19e61…

MALICIOUS

PDF

94.7 KB Created: 2021-09-23 23:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4e6caf072093a38afa9f6a6ea2ddf8c SHA-1: 6222b6d13905ff5b44ce8eb8fc4a37a0b2077339 SHA-256: ca000a2dabb19e6177dc29793dbf894f34ddab615204755fc9f7efd7e2cfaa43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests the document is part of a link farm designed to host numerous malicious files, with http://aprt1day.ru/file/4563502270.pdf being a prominent example. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://aprt1day.ru/file/4563502270.pdf In PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/60223091430.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/ginurupigotujol.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/87993404376.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/48319306518.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/79242576339.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/zisusufokakogafapa.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/36552650257.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/14040245849.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/34419644910.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/65791412410.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kukodofo.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/vigimelapupegul.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/47330643759.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/raxisazilosirotaja.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/50002002581.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210914091004188.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/51274055531.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/gemimifolusuzubupuv.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/desal.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-11/20210911212840143997.pdfIn PDF document text
    • https://riwg.in/userfiles/file/buxuzozamafabuvokeronut.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nisusumanaserinaj.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/wiwolabam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=firestick+software+versionPDF 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_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 10504 bytes
SHA-256: 7e5a1441ef978dfca7716163f070ce344931934d876b4c30e45ef92759b6bc9e
font_02_sfnt_off00013a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8B 19152 bytes
SHA-256: 99bb60bcf011fb7ccd51d84ca874cfd7d3ac68514f93996d4eb4d63485b62f09

Open this report in the interactive analyzer, or submit your own file for analysis.