Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dcbaf38fb7bf67…

MALICIOUS

PDF

72.7 KB Created: 2021-10-01 15:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 759786e38fadaff0f0615c6ba4e21375 SHA-1: 6586130e8546af58a97fe19a6ef284447cae7a53 SHA-256: a3dcbaf38fb7bf67bca1b2a7fbf2228fe4eac84231e00ee61ecc240248748cb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) and the overall nature of the links point towards a spearphishing attachment (T1566.001) delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bakineshr.az/ckfinder/userfiles/files/foneradesasut.pdf In PDF document text
    • http://radis-rrl.ru/userfiles/image/nugupevekunaxem.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/petuzinunobejusonotat.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/tijulozowozu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/77811965018.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/sivugukudavenuniluba.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614631052067c---14571399343.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/tixapixokaxozujekazibik.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/38034881452.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/39966744911.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/duzekalarubi.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/tasofoxapumosiwasekijom.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/zebukojutonuvatulixaro.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/28697739400.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/3254630171.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/75523102083.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/23029282400.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1d9e9f540b892bddfd8103d3fb38faf3/lofewodojusobo.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/91100636634.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/tojojotirum.pdfIn PDF document text
    • https://vitanov.rs/files/getuva.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/89410629738.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/guxizuruberovoxiri.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/85466086638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+robux+earning+websitesPDF 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_off0000b7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A0 10644 bytes
SHA-256: 3c75a531db5a742c786994c0f8d68a21c46c3c267c3912ee96c6f51d632a8e81
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 17292 bytes
SHA-256: 6bf5939a1ca804c6102622d740a09e2b0902b61a6b106a9aa5efdfa23888b286