Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb21fc6d349dcb78…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 17:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 961ba87bb8305e49b4beb217dd4eb3ce SHA-1: fe540fa3d0e496e71d93bf79e6225e067663fc3d SHA-256: fb21fc6d349dcb78f515a82eef5225ff5a4405f46388d46f10d1e41d3a216228
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm or a dropper for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF's structure as a link farm on disposable hosting, reinforcing the malicious purpose.

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 http://csim.jp/ckeditor/uploads/files/64744089549.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/lilomuxuz.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755cfe1d0a---26092595304.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/kaparekij.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/zowuferikanazakafamijoli.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/34728399665.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/86724959224.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/jezowefarojipedajeta.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/44982385801.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/tidujade.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/peleto.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pavokesixotusofabizajabi.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/21588698763.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/joragavozige.pdfIn PDF document text
    • https://unosms.us/userfiles/file/12109908788.pdfIn PDF document text
    • https://best-label.com/upload/files/segibowavazebozijozebuze.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/dinevatalawefagogifubejo.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/3493705923.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/55211890480.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/83106404334.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/doxunokolepal.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/ratak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+everyday+dash+diet+cookbook+free+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_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 17800 bytes
SHA-256: e37ac2007c7776791c9cc36e5dff00de28bbfdbf5184ab31c70716f91edc24cf
font_01_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 10940 bytes
SHA-256: b8b09db18c088840549a49008bb8fab14291ed8f72519088c3ce89795a8b4f52

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