Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2828143f0b8e8f7…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 13:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9ce25958381d60c4b528546d8df36c0 SHA-1: 8b5ed2479232d033ec9e27cc63b85e775a4ef52f SHA-256: f2828143f0b8e8f7a916bfd49a7c537a3b6faf7f5673fddc6557ab7bc4dbd9fb
146 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, many of which point to disposable domains and some directly to IP addresses, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://mvdeastudio.it/userfiles/files/magovusokomibu.pdf In PDF document text
    • http://jsqnchem.com/upload/files/kixavor.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/pefasokelezasajesojuzok.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061757470379.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/12502115866.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/75287608721.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/92152511559.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/50001102392.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/lijemavejafidinotuf.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62812200152.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/16565794577.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/tolorofedemapagolo.pdfPDF link annotation
    • https://quatden.vn/webroot/img/files/rogazuvedutatibigedesasav.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/vefevuxizizemitigav.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/88032702603.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/52377464550.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xidomibalujupoworeme.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/44043995729.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ld09ej3peedkmefruiba3pi0mr/50894301096.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/vefokabexi.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/wugukobuvajugotedatikef.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/55328491120.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f461554dd---bojagexixidizuven.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/diretokibesudugavaduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+pillager+modPDF 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_off0000bfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 10788 bytes
SHA-256: d3032b4ca60afa99fe53f6d84dd776528c22349e49e735623ababcee85769ccc
font_02_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 17296 bytes
SHA-256: 5492dc471aa48c873da1e3f94a694c6ee9804999c950b89f8a31177acb5b77c4