Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea18179895c7106…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 21:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e507fa1c8d612dabd7ae838b0b6a734 SHA-1: 295b1d73b16bce1ce1be4b9117540d74bd96bcf6 SHA-256: 2ea18179895c7106b400f600a7bd2ffa016a930fcdafe213a1acaab8cf0dd1f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection and ML classification further confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://innovatepc.com/userfiles/file/72943173219.pdf In PDF document text
    • https://cuacuonbentre.com/upload/files/22583727462.pdfIn PDF document text
    • https://vitanov.rs/files/84712451296.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutukokulasitad.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/19875105962.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/jogisijazewutoxiwazutaw.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/69141309628.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/88921471046.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911050733.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/65712924702.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d5ca7f83---nireduz.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090508444855.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff46c0ea4---sakikoka.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210905084515.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/vufovaxejugubi.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/84409462847.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/xawowapiwatelebikemurowok.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/46627608944.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/rivewikakofevobi.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021121297860.pdfIn PDF document text
    • https://novitas.ro/files/bigomadezivefuj.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48969917368.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/7635115983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+black+market+alphaPDF 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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 17628 bytes
SHA-256: b81461e94f1232f760cbd818fffa653bd56d768dc27fd00979b92bb1ae5be069
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 10840 bytes
SHA-256: b1c79e98e2abbd9b56a2ae4ca93c1db07289dfec12808490ff38e00eaa62742d
font_02_sfnt_off00012eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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