Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b7d9ac61b961ea…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 00:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80e454fc9404f4914733cb0a37e7a47d SHA-1: 2985a1314d9ef780a58d831b93bbf9b8ba070d83 SHA-256: 24b7d9ac61b961eae6520cd3a7d7efe6dd7cf5daa83269d751b06b51502e7513
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites for further exploitation. The document body is heavily obfuscated, but the presence of a screenshot lure and external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=azure+vpn+client+android PDF link annotation
    • https://weddingitaly.jp/images/file/94798134750.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161384f1ced189---fiborixenudo.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/9755175940.pdfIn PDF document text
    • http://salwex.hu/file/93588579134.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/54314405825.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/vizisujuzisoxipejajopuwe.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/nuzevoxusiletinegekegu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/35638820023.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/xiteroren.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/nibanivixadenusujuvakad.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910130019.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fifuzoxuwakadisukiwa.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/pivogoxozikijafatiduwe.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/tapag.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/monekigefefelabokimiwisus.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e19e4b18766cda03bdcabcf8c2d68b8c/rovumamunukimimo.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/xabenuwurolibamosurila.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/zidofipivekoniw.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/47030772569.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/jutikikiruxadibedenedube.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/38573710740.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/28863725070.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_off0000afb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 14236 bytes
SHA-256: a4798a4d92315955c84eb01a0384d96b87db1b2d6703b219de72b8a965b48c5f
font_02_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 10544 bytes
SHA-256: 165712006f0930beecc3c117e7e05a1868dccf773c6f93145bc8103ae704c919