Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7faf2163d1d1a7b…

MALICIOUS

PDF

83.7 KB Created: 2021-10-17 20:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 253ffb7325fee43067a627759667682f SHA-1: bd57ffe706cd490bd20023bd845dd79d0f30567f SHA-256: e7faf2163d1d1a7b2c7acc61c0af10d6531f0d60146e31e7244395dc7b481db4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, a common technique for executing malicious actions within PDFs. The presence of numerous external URIs, many hosted on potentially disposable domains, suggests a link farm or redirection mechanism aimed at leading the user to malicious content. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kosmonautika.ee/ckfinder/userfiles/files/pajagidejifu.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb15169cf---bapaburaxovatonenetunoz.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/wajatamazizitekalexuvoda.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/nivawe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16169b92d05804---mesosabelosidasesu.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/bixos.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109060307099000.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/25471054298.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/35245991428.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/72142724019.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/59429724007.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/jepinezuga.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/77568902169.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/sirogigefemuvuf.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/xesebolalex.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/60490378885.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/11139008842.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210916032605.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/lozivesodamubi.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/pugexuribadome.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/pozawurezakugut.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/mutoragowadozemuvimes.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/79698182703.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/43789381554.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/ravotijufusunogu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=vegetarian+coconut+curryPDF 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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 10376 bytes
SHA-256: cf914192123799675f501f46424b873a3fe06d6246976e8994bf08005bd85dd6
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 18792 bytes
SHA-256: c20e6a48496ff14fcb78560f8ed30016e00ce164d10fe1e61c3edfc89dcdf926