Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3109d925038efe…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc53d3b4ca5684fe599598d7b9738e42 SHA-1: b85f418febdb7b941d04686f15fc0f48b1de82e8 SHA-256: 9a3109d925038efec03280dffb627bf91d492d83805931e04134b12908c0d5dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports a malicious purpose, likely to obscure the true destination or host multiple malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://unchiulmihai.ro/files/fckeditor/file/kadopenetojemudaresu.pdf In PDF document text
    • http://reclameindex.nl/images/uploads/vomusisabepakirerukugog.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/zaxuvarupegekopalexekiva.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed6f53f47---fivuzoraxinolomovezoji.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/96381803881.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917150201.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/donizuwefo.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/lotev.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/53481030907.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/sawojugowixuriwi.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/bekoxasiwefofadenevekut.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/vibop.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/21705249164.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/38540657215.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/zevumowurukifajisife.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/6579621744.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/juruwununetidadinivi.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/45025188164.pdfIn PDF document text
    • http://araratmebel.ru/img/file/kolimowawowu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3f45724617b80aeb80fbb93000521217/88944193046.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/bizawekoxepoberasesegoxid.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/5036098242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=power+bi+print+to+pdfPDF 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_off0000b22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22C 10344 bytes
SHA-256: f97882e5d53fe6327001abac0c574e97944c3a559d4a47eea682e06c79da523b
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 17240 bytes
SHA-256: 7b98d532dcd3ed51b5e7d624a6df8132f4fcf59f5fa246f9e27dcc51fd95df30
font_02_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1