Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a8616902825be1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 05:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97eb1c8ac61980f1f7242c012b19fc99 SHA-1: 0db717e8a3c74292122831fc6f6ab5bcc275d317 SHA-256: 69a8616902825be1cb9adc0ef4825bfdfc347e1f7a73435a43ef439c885bcfe4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, characteristic of SEO poisoning or a large-scale phishing operation. No scripts were extracted, but the presence of many external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://signatureshreyas.in/userfiles/file/vogazudazumidikukim.pdf In PDF document text
    • https://locktactyuma.com/userfiles/file/nobiseradobuzi.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/56571442992.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/93376934687.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/jorizopopefopinava.pdfIn PDF document text
    • https://premium-house.uz/images/file/81085227864.pdfIn PDF document text
    • https://mar3ol.com/Files/files/gesodofifejomodu.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/19119853241.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/mifenoloz.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/35426854786.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/besulomo.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vesevixerujakubadanavulip.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/gujineguf.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/84318196244.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8903cf58---40986210690.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/32600219488.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/xeneximotekadoxufusata.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/lofifovi.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/kuvoxizifo.pdfIn PDF document text
    • https://motoralbini.it/files/file/sagapulas.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210917200556974011.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16139875e8d57a---91172673536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vpn+profile+android+freePDF 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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 10192 bytes
SHA-256: 957df76a0dab7a8b1fc09b35f0a72d9ef375fb8709b3c16118a20e2a1b35f5c0
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 19460 bytes
SHA-256: 60a63b453040f24af3e1355b0772ba53644e2528ebf8b748e8ab8546a413fae9
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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