Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c58162f05dfb442…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 15:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8ac9418618ed1305e2aab0dee33de05 SHA-1: 331dd8dfead7def27fb31b47b1b8c7a654367c77 SHA-256: 1c58162f05dfb44275123daac1fa852d2a3f3870f63c37fa2bf6240cb03fb8d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirects, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dailyhondaotomientay.com/upload/files/zelitiseganipavijig.pdf In PDF document text
    • http://ekonopuntos.com/campannas/file/52348026122.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/torubilowaromobogetiw.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/tifof.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/wipera.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/niwuvadazuguwiwus.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/liroluvesolumukikonuzalil.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/sawunalokapuledukera.pdfIn PDF document text
    • http://banquat.com/userfiles/files/23785971196.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d660617f8d---dagirepunowomuzutoke.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/70084967082.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/37003247956.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/40394776517.pdfIn PDF document text
    • https://matricula.arendic.cl/files/lewenasizupedu.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/ziwewo.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210916_98F2E46C8ACD44FF.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427e396fe32---davuvejepenareb.pdfIn PDF document text
    • https://grouptm2.com/contents/files/kuzolaw.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/bugekusewojurinefiza.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/gubupaxa.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/lupazij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bus+games+3d+downloadPDF 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 10712 bytes
SHA-256: 347b91ae670454493ce355dcb6827df43bb1858474f6512ddcd64e42f64f5bc2
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 17924 bytes
SHA-256: d0388f200d60f553725fbcd0ad6cbe21ef0219b733584a16ee26f3b1866f9b9a

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