Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfe92d03bb02fc9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 01:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b98042f0adb6e861f1ba54511a84089b SHA-1: c2d1b6b9d3381ed5a8d9df96deb688a43467f895 SHA-256: cbfe92d03bb02fc9d60e455b8b6bfe71050e75e170ef8b72ec2b281ea15ee576
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, often as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=non+metal+reaction+with+acid PDF link annotation
    • http://agataklimowska.pl/userfiles/file/28329637975.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/lumikusojukivexopobo.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/66384122523.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/rowekiwugapivududo.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/38570134911.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/32725706677.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/kusafumejadivili.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/48040335378.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/dagaminumisesiwefasef.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/febokupokojelupupogepe.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/zulidejunut.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/pelulirofemufepujajij.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/01/file/nidepeze.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/juzaki.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/razoraxef.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/kesopozogofut.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/39544548618.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/84565987235.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/19935741576.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/81285467209.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/73173833170.pdfIn PDF document text
    • https://penzion-palice.cz/content/26662489146.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/59073575548.pdfIn PDF document text
    • 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_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10532 bytes
SHA-256: 89f563d7e933c6f2e9028eb29ce4399ea6ccb79f8e02e814fb84bd23ba2a5c6a
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 16740 bytes
SHA-256: 8d3d08d5a0ac9f9e6ae079a74d83df998d8ffd72805cefdb5a2c9b13e07623f2

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