Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9492f59295557b6…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 11:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f00781c7ab99534401063afa9b8e93c1 SHA-1: 90ba983b7ba9265cb7dfcf77d7c79a1bf14ec4ae SHA-256: e9492f59295557b6578a6cf28fd2ac02130511a8450aec3f9ed6ba876bd05c6f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://cleanking.net/userData/board/file/25636610057.pdf, are likely intended to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://cleanking.net/userData/board/file/25636610057.pdf In PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/vawodajudororen.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/megefanofazo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/256b73db34d508bfd6ccc7d033956c00/99400818420.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/19116173321.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/2232393787.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/vinamixagoferiwixigobo.pdfIn PDF document text
    • https://longhungphat.org/Images_upload/files/99931967016.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/24277524592.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/72573353092.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109030802555974.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/59581706515.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/56465504172.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/pibolisazizuginivivawo.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/gikekizumov.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/76747cb1a12029fe3d78c8909a5b5c7c/rinaxiw.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/likita.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/30033643808.pdfIn PDF document text
    • http://hanleyresources.com/images/29783044486.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/rimivebisus.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/folake.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/zeleriwi.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/ramodoretagoxaladetem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pc+energy+usage+calculatorPDF 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_off0000b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB254 10528 bytes
SHA-256: d905cebe03539ad412a63c9d111db290c2790d63494893406e9ee8384c5ac4ff
font_01_sfnt_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 18504 bytes
SHA-256: bef8487a44e3d159ed6dab76a5c2ed0e09bc7e6f850078f29940cfa5acdd53f1