Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b36c0df37fe1b7f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 11:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7d2b1259037fb9a1f52e7bc134e8e40 SHA-1: 2dbbdd2950178c5ec2deb501c64c78b91ea157ed SHA-256: 5b36c0df37fe1b7f932caa20586904001f2f9dfe3503b1dad85a2957d0132d06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous URLs found within the document, which is characteristic of a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/99750894680.pdf In PDF document text
    • https://gruntbudowa.pl/files/file/69969271051.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/41112093894.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614677690decb---83792860754.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/jujuzenazukebujur.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/16717101282.pdfIn PDF document text
    • https://suksesunited.com/contents/files/zaguzawetamo.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80081581286.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/botuledorijixulemoma.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/68757575907.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/wokusop.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428dc0e908b---wenifovumalaru.pdfIn PDF document text
    • http://3q1p.com/upload/file/210908185244056376zu9tcsbpopos.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/44429324762.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vesijezusumawumobepojelun.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/8261101713.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/66110981222.pdfIn PDF document text
    • http://robbes.nl/media/files/junobamagazaka.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/96678552339.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/78180743366.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/91385789334.pdfIn PDF document text
    • https://krossi.ru/images/content/files/70582404775.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/ravomeraloveri.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/pizafigumex.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/89929742905.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/dipebagonobujowil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=keema+used+carsPDF 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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 18664 bytes
SHA-256: d87f87a78c3a30916ba34cbac509267c8300d35664c197b23b2f9de94414a88d
font_01_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 10160 bytes
SHA-256: 2bd7d054f692eef6a967857f0fe20790536dcd35402daf31b58264a2f02075ea