Malicious PDF — malware analysis report

Static analysis result for SHA-256 946820a02a534fc9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 07:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b6ecbe4a1c37e5604dea49acc78febd SHA-1: 4760c0e2cf7ed3fd22350bfe29a5be6eed207cd2 SHA-256: 946820a02a534fc90f398f2da525054827dd14d167baa8ab6ff27f49f1cb2c85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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://gaestehaus-am-erlkoenig.de/img/editor/file/73018780482.pdf In PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/fawizepumulaxabatud.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xumumexebiwo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/17408793074.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/52274445698.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/mapoda.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/68875202324.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/69623177335.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sezabetulafoganulexowon.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906014411.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/89992498234.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/18814796895.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/35381413797.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/32133833247.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/48717047239.pdfIn PDF document text
    • https://nomortiga.com/contents/files/63833418250.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/jipuju.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/48745539561.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109030357458963.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/19861733005.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/5712680583.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/rapudukexadeki.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6ce7f672068a1b314e61a38759186a7e/retizisomizeluwozowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=is+it+bad+to+put+a+fridge+on+its+sidePDF 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_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 10816 bytes
SHA-256: 06cc7b77f59dca21398cefd03fafdd2ba6461280b597682072ba49aa49daf7dd
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 17140 bytes
SHA-256: f98757376e7f0287c40b8480d14b3fbff30db4d36aca42e740258085de3bb089
font_02_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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