Malicious PDF — malware analysis report

Static analysis result for SHA-256 2591b84a39331d2c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 02:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72551356fc59e36cf4b167c1e9dd7ef9 SHA-1: a6b53ce67e55a714cdddbfd46e85b91b77755da1 SHA-256: 2591b84a39331d2c2ffed7a8424c4d9b53246ef7a72599013d4b27029e2f1b94
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URIs, including one pointing to a raw IP address, which likely serve as a link farm to further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's purpose is to direct users to disposable hosting for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce3e499e2---wurukumaputuzobimolugo.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deedfea8d0---sipuvejidu.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/koxijuvip.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/9096949919.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zomogerijogidusujog.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/tegeritawumokivur.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/53031689730.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/penonudozijaxo.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/ruropubefefuxebu.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/wazipitotimagemuzebu.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/volulet.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/59925567218.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/75096914021.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/milapoxomum.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/72359192505.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202193017357420.pdfIn PDF document text
    • https://miet.hu/kepek/44429301215.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/duripunerirituk.pdfPDF link annotation
    • http://massimosusto.eu/userfiles/files/kutezit.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/kekun.pdfIn PDF document text
    • http://planbmedia.hu/files/53020535010.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/dedupavuxebudesubowul.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/13390278891.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/xijizoxowenebavo.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/83908890029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=theatrical+elements+of+oedipus+rexPDF 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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 11052 bytes
SHA-256: 3944b34baf3db996c2fcb839d133c576f3c0d338fbf020658e074c27f20dbec2
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16820 bytes
SHA-256: ee02c7daec81c20204731a41c138ce08e02bf689fe8f661c8392a145865fa585