Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad571177694443f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 16:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04526e6edccba961a5d68e372632412c SHA-1: b9520c197d4aee80a4980465d63774aefc6a762e SHA-256: aad571177694443fcc96a1438bf4d2b0de6abb8e58a19d822a6c3608765a09ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://philabc.ru/uplcv?utm_term=unturned+gun+list PDF link annotation
    • http://ibnuaffan.com/ckfinder/userfiles/files/5571933031.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/27798918192.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/loponi.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/86309357519.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/pujusanozatadugarivumidux.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jabonewo.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/49953309585.pdfIn PDF document text
    • http://elsped.hu/files/file/76241693863.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/89037445895.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/41768384841.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/61375150479.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/34315378860.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/xoparagof.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/libudadelujumodi.pdfIn PDF document text
    • http://coffee33.ru/archive/file/76857881489.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/21268645841.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/47609310034.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/wadidevidozadixuwegis.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909210836150997.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pedorewiwepejatizogaduf.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/25424200024.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/mizutupopulosolavo.pdfIn PDF document text
    • http://getdol.com/page_data/file/jopiwute.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/51970505169.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/febemadexu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/28229770564.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/wopabebusefatuvizimora.pdfIn PDF document text
    • http://hbaoge.com/upload/files/tijunufiteriwefawi.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_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 18964 bytes
SHA-256: 83df046602aff7cbb3e4125244ef22e4827058237b6c0f247bf6731f9a6dee2a
font_02_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 10248 bytes
SHA-256: ee8b43745f6e825b6556bad5cdf46bbefe2c9385363e1b240d16cae106a7badd