Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c50fadb54ea7f4b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 11:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 162f2a5d3c56f68bb1ce0702bb0f6a0b SHA-1: 52a4b4d559f675a5bf4e4a55209490bf0fde6a5b SHA-256: 6c50fadb54ea7f4b5730a1f0c760461169efcfcb471e33ac0fb19ff9a71f68b3
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on disposable domains, indicating a malicious intent to redirect users. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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 http://netcentricnj.com/ckfinder/userfiles/files/74113235267.pdf In PDF document text
    • http://volareinmongolfiera.it/userfiles/files/gadoxi.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/53609842116.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/mugomujoboxekalu.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/50170763742.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/jatutotamaj.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795bea554---bezuriruweranive.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/kuxurufinidaferelovirumit.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/38414589698.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/fazipajipuzagajuxibite.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/12100275715.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/winuganox.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f67f75f1f661b630eda8de64e80469a/zivozomuwir.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/97306891651.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/66626698710.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/49020006335.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/kafevuvawubon.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/40472172113.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/tilixekakamijov.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/masedigidavitukab.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/lefexupazub.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/40322309936.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/76434717182.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/baradakuxaxoxeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=360+video+downloader+for+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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 17256 bytes
SHA-256: 5e6cba289066cf17b610002dc8d6ed7895fe7ac3caf9c7eab301f16132e582e6
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 10600 bytes
SHA-256: 44e6fc14fa108a8b5ef7c0c2249d4873de30334f2ea4eb9c087227d5aeee8e25

Open this report in the interactive analyzer, or submit your own file for analysis.