Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4bfa27336661b5…

MALICIOUS

PDF

93.3 KB Created: 2021-09-12 03:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f62c19569d365c218380165d11961b16 SHA-1: 1e9235701adfeb28a01d9f217fd95912c9b86fe5 SHA-256: eb4bfa27336661b5f3db45bfd9de5d8cc5c34485326ed05ca5a600b5edbcdd41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=naruto+shippuden+421 PDF link annotation
    • https://kamarkosong.com/contents/files/luvefazetawenosovilolow.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/kitonavilafi.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/34292341094.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/jiwapikevogamefopasif.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/78283194811.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/29102251008.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/96689456483.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/63582450856.pdfIn PDF document text
    • https://megashina24.ru/files/files/27289151152.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/lurelesovamakigilez.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kovutirokabe.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/74612324737.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/35156783995.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/pefalapidomiwadamavus.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e46b3c0b---64952143226.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-6/20210906010506244108.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/tametezalo.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/57162562441.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe0ade9e6---tojorevamadisodujigiw.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/wirajufoj.pdfIn PDF document text
    • http://fruitvita.com/files/files/3634383299.pdfIn PDF document text
    • http://videocycling.info/files/file/1158566456.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/89122749430.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348b509975c---retinexa.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/zumitox.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_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 10772 bytes
SHA-256: 1a3a4b5ad6e3997a8b9492214a7dcf3c80dde3798556d4f291db35bc85574c17
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 22108 bytes
SHA-256: 7741e925a3e53b1361d5aab1acfd7757620bc6bb33bd10cc54a181d647246dad
font_02_sfnt_off00014fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1