Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c58028c6111937…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 22:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c2b31572a023c31a81fe32398f99fc8 SHA-1: b964354c9ed34d3c174185a12bc50668dc197f7d SHA-256: 59c58028c611193798e1ea2b06a994c5a2a7149f084eec2ee66a777e71b319ed
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, with one heuristic specifically identifying an algorithmically-generated URL. This suggests the PDF is designed to exploit vulnerabilities or trick the user into downloading and executing a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://titishop.co/upload/files/59971646219.pdf In PDF document text
    • http://klemanpince.hu/files/file/4774855397.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/pozubejumopiwalezoguvuf.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/zazuvaxaj.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/kafudomarurulolaw.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/64769764873.pdfIn PDF document text
    • http://chinahongji.com/d/files/deruju.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zogij.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/punajuvosimisutalo.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/jonejubeleroz.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/zazarejafikivosi.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/99091834679.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/64735574204.pdfIn PDF document text
    • http://net-marketing.hu/images/files/70700680081.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/3086040029.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0ba2da03a79093cc15540969e2c4377f/gilizam.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/60126532247.pdfIn PDF document text
    • http://kelvista.lt/images/files/fuwirekitosevapedi.pdfIn PDF document text
    • https://badoza.net/userfiles/file/8904584117.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/vuzupofig.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/ragaxatipifimixovefezot.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/rosavasugekorupupi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab583a433---66402393665.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/68684534862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pool+slide+story+mod+apkPDF 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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 18120 bytes
SHA-256: a1d0b0e801f65cc2040fafe8c768726fb783736bd50d2e7ed21bc49ec9bd0b3c
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 10656 bytes
SHA-256: 2b0c927dc4e8b4c30388dfbebadad3ef7801bd45793ac013916e86b61197a73b