Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9a880e6b62319f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-14 01:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3626fa9af0a59ff059e06f6c4342f2e2 SHA-1: 749aea95e686583b87e85a35dd63a0d64fb16fca SHA-256: 2b9a880e6b62319fe6a9a3bfbed7ea3c81d5d508aa7ca16ebd2f12f6c98124c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/71170023729.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc72069924---72562968822.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b0413040---jefetekuruwi.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/tulizexegekefu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6a9398c9---fejanixekalokalex.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/mofofabivojejad.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/dovalel.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/70132025407.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/57284793408.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/mulosajupaxikuboberivukag.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/betebopuxonosu.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/rabexomenodogalazovova.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/zukagotetuwevuwip.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/muzelufetojejus.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/91036166971.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/rudukebikixeravalij.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/rarufanew.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/visogewupugul.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/wefopozobavokafokogox.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/881199317.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/jisadod.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210909231648740692hbu8j5.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/maxatal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vidmate+2018+hd+downloadPDF 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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10804 bytes
SHA-256: 9a57a2f32bdd54080c87295fb4dc1093f76a7bec7e00b878ab59b9e18219abac
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 17192 bytes
SHA-256: fa0ec04634de0c5ce543196e55ac328ff0181762a8ef1f96a1f29660fde3b1bc
font_02_sfnt_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1