Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad3c4962630fd70…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 15:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36555d01d62ef7fbe89fb96178d26efa SHA-1: 860e34bfa7827938ee57744149d2403a22622b42 SHA-256: bad3c4962630fd702a466d59eef58aa837ea8ab3639ed3fad58182ad988641da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary function is to redirect users to potentially harmful external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://puzynowska-kancelaria.com/userfiles/file/63197266472.pdf In PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/82264949860.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/89c07a0710261bac1f7226a6fa625c57/zodelegawevu.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/89070212438.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/71670474279.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/setusemimubepireli.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/64315502291.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/pukujubaligalipolidajax.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/satidiramorowat.pdfIn PDF document text
    • http://schokozentrale.de/idata/budajut.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/64286626413.pdfIn PDF document text
    • http://theponghop.com/upload/files/pafuzevotoromunuxulufob.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210904_22318E0AA29C74FA.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23318977344.pdfIn PDF document text
    • http://erex.hu/upload/file/80014656029.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/36045886757.pdfIn PDF document text
    • http://telecycling.info/files/file/60157426266.pdfIn PDF document text
    • https://ms01bet.net/contents/files/29923091958.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/36198007893.pdfIn PDF document text
    • https://aokman-drive.com/d/files/lalugatirakumuwinixaxe.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qcn436d48h1a02cqm3fabfunio/minuzirejokonojimebuje.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/98681545413.pdfIn PDF document text
    • http://enricobarraco.com/files/jokujexojoloranajopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pegasus+spyware+apk+downloadPDF 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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 10768 bytes
SHA-256: b983b309f8cd3ee94fcc7da5482aa2693ddc726c49b7da84aea0dedd29843c4d
font_02_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 18204 bytes
SHA-256: be3b75289543db01f8b0bb3c0b4e6ab126d673913d7af5f9b42980e4f60a406a

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