Malicious PDF — malware analysis report

Static analysis result for SHA-256 d134374a3548567e…

MALICIOUS

PDF

82.7 KB Created: 2021-10-08 21:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ce5edccd69afc62e10981cefd2ee8ea SHA-1: 8102e2456b337d99f6c7068c87eb91c068de1d73 SHA-256: d134374a3548567e505edd38b24ba501aa456ad4ee9b71ab7e856a705b032e4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://drafthe.ru/uplcv?utm_term=the+mysteries+of+udolpho+pdf PDF link annotation
    • https://mycocoa.org/images/upload/files/71830710579.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/fadozunipovega.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/2447631594.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/xenovudosebenezob.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/14/81016423522.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/77665388604.pdfIn PDF document text
    • https://etimes.mn/uploads/files/64363838048.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/83943241838.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/25571063001.pdfIn PDF document text
    • http://shinhwacar.com/userData/board/file/54233985737.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/pavimumoxamisipove.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/voliwoguzobanor.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qvvk2ub0sia2cl9c2hhotscvo1/metadovamupuwig.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jatemenabigiragulapuwapaz.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/54036084186.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/91956050915.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/80932114759.pdfIn PDF document text
    • https://badrivishal.com/media/75793795660.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/vutaxipimibamopabo.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/5453765389.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/webapujolaxemobakebut.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/lidewiralofozavukikifelo.pdfIn PDF document text
    • http://btfa.tw/upload/files/75915131598.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/9105815908.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145684189f36---63134384527.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/givovitejuwilewatewawafen.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/77625552892.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_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 10672 bytes
SHA-256: 4f988b436a799771b69467050f44d7530f3561fbffd4c2c58ccc64c82d6cbd8c
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 18388 bytes
SHA-256: 30982966f8d55a37b5cdc1a7d5072bec42952e9cf23bbfb624135c58f7614e20