Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f677553e5c6c8a…

MALICIOUS

PDF

89.0 KB Created: 2021-09-10 04:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 527f4bb40e3d55db6af55e10b184f7a0 SHA-1: 6848a16273af00d2dbd48b03e165a37a92a14959 SHA-256: c4f677553e5c6c8a09f86b403de81a593215c5454bb8ddd462002b1920bcd8f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it is likely used as a lure to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=how+to+take+a+screenshot+on+samsung+galaxy+tab+a PDF link annotation
    • http://elitvorota.ru/f/file/53555563607.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/pawesonipupezi.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/93106394777.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/tebatujemabugotore.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135be091b86f---jepulepumapu.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/29853493619.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/48795437223.pdfIn PDF document text
    • http://movediary.com/userfiles/file/13402400583.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/ridibedoxokejasux.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/kefufurawiv.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/23717998690.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/lobix.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/8792749105.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gonapegogetujamelitutul.pdfIn PDF document text
    • http://myphamasia.net/upload/files/fapopax.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/85737281450.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/71163678285.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/27512128716.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/jataw.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/jijovepulavonujugovododew.pdfIn PDF document text
    • http://slovoveri.org/userfiles/47146521751.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/14633543446.pdfIn PDF document text
    • 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_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 11208 bytes
SHA-256: 5c7bcdd6efeec512426a251b13947cf12860e3a9ba1857c7a73a01b5dce29204
font_01_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 18464 bytes
SHA-256: 5925ebf24f62d43eb633ba128b72585eb16ef6fe58e1b9d967ffff22f1a4e151

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