Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7dcfe91f492eee…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 04:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e3bf37fd9a0bb7e98d637384a90f2b6 SHA-1: bcaa17cb6179789f1bf403509e2c957e9e33a72e SHA-256: ae7dcfe91f492eeeefd6aa2d8c6c7431f07f4504f6812cb85983775f94e183e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=redmi+9+versus+redmi+8 PDF link annotation
    • https://tanthueviet.vn/img_data/files/29528147629.pdfIn PDF document text
    • http://talesma.com/E/file/82995596314.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/62624069079.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/sonolaguf.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/50522531488.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/buxisiwaruzoradufuru.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6acdfcb728fd788e828f1fd83d1df3cb/9627869137.pdfIn PDF document text
    • http://mutitar.com/user_img/files/falapobilugeterabuzovi.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/jifisosijegujifesuwomex.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/77290307381.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/pawuvedu.pdfIn PDF document text
    • http://a899.net/userfiles/file/fulapunibulixopazog.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/lopavadekaja.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/90355965065.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/28701573512.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/jobibolijitok.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/2523255577.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/beliwixegepowev.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/84184987991.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/77830213332.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf8c04c16---45987115000.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/99489060703.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99500657781.pdfIn PDF document text
    • http://djapm.com/userfiles/file/56471479932.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_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 16872 bytes
SHA-256: ab646614979ed6257f6a1c4f46904f13c3f577340a9df3343315f95f61cef4e8
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 10464 bytes
SHA-256: 93ad37ba87c0b6b67df15dd35afc1b31c1b0ecbe29a8e8ef897cf81d4b15f7a7
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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