Malicious PDF — malware analysis report

Static analysis result for SHA-256 af52c03c74a07f30…

MALICIOUS

PDF

67.5 KB Created: 2021-09-29 03:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5d5eae14a25e1ff1972210a53a70e123 SHA-1: de0d5f5e1c44e41c21b7d672670cd8ff38e45e35 SHA-256: af52c03c74a07f30a3b7508ae2d69d41a7a880eb72ece3b1c98bc002f8a18e7a
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=free+online+books+pdf PDF link annotation
    • http://gold-carsales.com/js/upload/files/dulit.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/jukimigukagorimoz.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zurejapivejavozu.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/gosovupuvaletupupubed.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/17482397809.pdfIn PDF document text
    • http://land89.com/ckupload/files/48964977971.pdfIn PDF document text
    • http://demkapi.com/resimler/files/59543220157.pdfIn PDF document text
    • http://scsychem.com/upload/files/81885325273.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/40267991706.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fugorofoxevowop.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/67831746680.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://fleschimmo.lu/userfiles/files/kemamowobikululavamuj.pdfIn PDF document text
    • http://suaups.net/userfiles/file/ximunikopel.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/65085867697.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/jejoromozasubexex.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/bozaxuwozimetasi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/46942626498.pdfIn PDF document text
    • http://sgpeo.pl/users/file/88035986865.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/65358490056.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/50265813207.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/71089218747.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83309803968.pdfIn PDF document text
    • http://swhos.com/upload/files/62015500402.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_off0000ac5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5A 14724 bytes
SHA-256: a2fe0c740682b6db88ac38359caff351cea7c0009badbe9274d118c984befa74
font_01_sfnt_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 10440 bytes
SHA-256: c5da861b80f49a9b2ef94ff2ac3340a41020bee01e43f79945590ef2a23512d8
font_02_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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