Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38aa34d621e27c1…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 14:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f61a88e570a69336b0e2e82a6a6aed7 SHA-1: 4c3defce7bfcb620773408bade7318b30d723716 SHA-256: a38aa34d621e27c1678628de6526a9e62d1b20d461cc09078721ac6a21342e43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed to host many links on disposable domains, a common tactic for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://adec-interiors.net/Uploads/file/44825903529.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/70756521507.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/timotep.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c8f3073448cb1391993d1a1d6dd6579c/58274313413.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/rivovovuvofetorekolozuxa.pdfIn PDF document text
    • https://redac.ch/upload/9004234190.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/30712080530.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nedogo.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/mokesuvupadojisemibefej.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/nigufulomumu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109072252253463.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/leleza.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/92774407183.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/totixumebezevajo.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/13500727577.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/31082583431.pdfIn PDF document text
    • http://rafaelokazakov.com/file/88742038021.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/vukikutokunisizopifumarak.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/89473032116.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d878b13678---5773019677.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/wawedutefejazaridebapulik.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/lugefu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/marudukopomefedoxebawuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cell+phone+emulator+for+pcPDF 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_off0000b057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 10616 bytes
SHA-256: c0e23c70acc827084fe41b1608b32a8a6f3ab402b01161332f17a41f8a889559
font_01_sfnt_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 14228 bytes
SHA-256: 5785c881de52f46ed601a3f25babd4f242169d150647ad420c6cf1136c171f9b
font_02_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1