Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa1e5358b24c1c1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 09:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95353c57fcd7a20304dccad40e091b69 SHA-1: 1f7034890f2e778ef1550c64b78655fece314a4b SHA-256: daa1e5358b24c1c1676d296d9f6667727691194fecb327e0ec760683537776c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=android+10+get+unique+device+id PDF link annotation
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kikedupisokozavedivod.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/zazigowufasutufegezopegi.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/periluvem.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/85517861338.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/30034961094.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/273e3b8525ddd1529733d2cf1801a7a2/99146285771.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/13067905026.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/42317954924.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/22030036010.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/ditefilovevejodivowazuz.pdfIn PDF document text
    • http://ciskmv.com/css/file/katipidogosaxegibaka.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/jesuxuxemofatawuwawaxi.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/68052421570.pdfIn PDF document text
    • http://word.mn/uploads/assets/94508959399.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109070905533313.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/27055074418.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/9174822411.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/98247986003.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/vujelaxipanun.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kisubufajakokufu.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/48116608670.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/zojiwitobujoruperutasa.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rusupalakukolemebaneve.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/8227212527.pdfIn PDF document text
    • http://asvpp.fr/pdf/52329253881.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_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 10636 bytes
SHA-256: d821293e193b8551cfde11de6931686255269ae6ebba255e0c834e4de9bd4536
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 17908 bytes
SHA-256: 7bcf4b4a8bef95d128d7f239399ea3075f085f3e4c7ba41152c8fc1bd3d98a9a
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1