Malicious PDF — malware analysis report

Static analysis result for SHA-256 28198a9f63d6e937…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 18:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4728d947b3f50a3521ebf98783a990d SHA-1: 0645c3ba020c481cadaf73b97ee86b687a9b34f9 SHA-256: 28198a9f63d6e937fca76a5d60d68ad965e9773524d01ac08858e2d86c43379a
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://xn--h1acbpobggs.xn--p1ai/data/files/fasepanelovilomenev.pdf In PDF document text
    • http://ahkkpcm.org/userfiles/92243028553.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/64817454217.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/xorubopopuguwaxabig.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/44476684743.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/97808599935.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/99131755195.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b35bff1b---27129050535.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903034547.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/40150784035.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/44976256861.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/94108406893.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/ponogazugovozoditirarota.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/28251084513.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c5b678ea3---81692544987.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/35589436287.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/gitatuvizenijosubunalan.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210913105903.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/61151333471.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109070422427178.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/34846905681.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kadusowepexalexenemanamik.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wovofererujomijawebebo.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/bajilevadosabakani.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/kalubowawodomaxuvaxupa.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/jarurasareluwajagonafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=prueba+enlace+2014+pdfPDF 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_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 10748 bytes
SHA-256: 3f838561f3944615a867305ceba38a19fe139420c373f198e60c2ea0762f79c2
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 17260 bytes
SHA-256: 86e708a5195c8c24d4ef1044799303a448f68d5844c870051aec6a0893b5f865
font_02_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1