Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ce48772964ea91…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 11:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 712dd61be73fc9aa97080b469a3aefa2 SHA-1: 922c3a806c787deafea9ab0d09df00a175baaec1 SHA-256: 28ce48772964ea9170aa1c95f816e974fe99a0851cfdb1d07dded218f9cca503
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on various domains, many of which are flagged as link farms on disposable hosting. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of these malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://deeringbayrealestate.com/userfiles/files/82475764148.pdf In PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/33416969702.pdfIn PDF document text
    • https://limsurdua.com/contents/files/68926195006.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/47048714847.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/57492597629.pdfIn PDF document text
    • http://tiquital.com/documentos/file/1192899758.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/meloz.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/botudewigokodoxurav.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/rozujukolazu.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/78394689218.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/40422771169.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/jovane.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906172739838175.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e301bacce46dc0761e5c71c72cfc98b5/79086353900.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/maroruluzoviluru.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/xumudezuwoxejulu.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/71614509359.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132c0018aa7d---14273937519.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/dujokamewonabe.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/87931743012.pdfIn PDF document text
    • https://limsurdua.com/contents/files/15173065090.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/giveborodas.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jelafezapewizogag.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/35758905596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+stop+redirects+on+android+phonePDF 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_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 18564 bytes
SHA-256: 8d24b2766ee3325bc01c4ea09dd2975bb5b38b59670d42391ea10a79c9330d0a
font_02_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 10644 bytes
SHA-256: aa7fc13046161321b3023642a999c839aba57649bb2c87c8b3a35d36b69eb1cb