Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcb8d67a8be4862…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 07:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a7826d13bdd4366d79f2fe3cd8c1fd8 SHA-1: c8817599516e5ca4c1f279f39c35c94f2ac233e9 SHA-256: 2dcb8d67a8be4862e32e7b1028ff2fdf3556ac33aca1ca9f08ca44cc185421ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or execution of malicious content from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://weldingplaza.com/files/file/zulabavij.pdf In PDF document text
    • http://www.colormotion.cz/UserFiles/file/xurojifodusesu.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fujutepuzalowupugikuteg.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/99983591592.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/16088539869.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/pawuzonetusosonakalaro.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kiterajejopolubu.pdfIn PDF document text
    • http://maxbrio.kr/files/files/61504761678.pdfIn PDF document text
    • https://33mobility.net/uploads/files/babunelide.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/bazisilusosunuwipez.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/kavukusaranelotow.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/89279553708.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/venamawadipaki.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/dugulivomafebojetujitije.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/17093365855.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/97612593994.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/96857365456.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vovonufigujasuwugejesava.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/lutubu.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/kisejatukuwuxafud.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/82746691553.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/91874996759.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/83613422458.pdfIn PDF document text
    • http://www.toptehnik.si/images/lupuzo.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/kuditapodozalofujuwekekok.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wisudusuzifeloxunipowev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pair+a+ps4+controller+to+androidPDF 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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 10660 bytes
SHA-256: 0fed4e2e1ae32d0d14108a9080bcf7e506dc94ce7f6994595bf63b24ee51d91c
font_01_sfnt_off0000d57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 15776 bytes
SHA-256: 1a3faad9448f4f3c24756f7d242224e497a37d55c53db21bdf924c4df99253c2
font_02_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1