Malicious PDF — malware analysis report

Static analysis result for SHA-256 a375d01fc1678de0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 20:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cdc3c4b141fb4a086b406dff48851a8c SHA-1: a5d5469e9e5e8e6985366e0db648c4c1b97cc4c4 SHA-256: a375d01fc1678de0830869722dc1d30950053deec9cb59176175ca80236f9959
174 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating embedded JavaScript and links to algorithmically-generated URLs. The PDF structure and external links suggest an attempt to redirect the user to malicious content, likely for phishing or to download a second-stage payload. The presence of embedded JavaScript (T1059.007) and the nature of the links point towards exploitation for client execution (T1203), with the overall delivery mechanism likely being spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://asiantms.com/ckfinder/userfiles/files/pozapinufaramamutusule.pdf In PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/sajafusanimup.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/74473835957.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/799398145613f38be4f50d.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/xizezatiwigebotoxam.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/zifafinobuvob.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161431886ec576---59141356843.pdfIn PDF document text
    • http://nineslash.com/user_file/file/16606451378.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/wilelivexitavebixetisozu.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/42819386059.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/86320435134.pdfIn PDF document text
    • http://fetogram.ir/images/upload/files/xikobonuwiximogudusaduv.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/74524351895.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/30134617198.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/29dfl1pr40ju82gq05vm4g7hqv/kuzikona.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/7831296251.pdfIn PDF document text
    • http://castel.lu/userfiles/files/loneduwonewitopaguzisin.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/90602315618.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/76623328814.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/97065659898.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905135632489.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/10679097566.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fidesodivoxipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=uzumaki+manga+pdfPDF 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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10436 bytes
SHA-256: 201b550590b8a6b68b3e144293c6acc75db4f0a3d4db464ff4212f8ccfdf17c3
font_02_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 19384 bytes
SHA-256: 555bb71ae3de98e27bbb0e93765d9fb6fb89b4c096223247636079343af521cc

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