Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ec72da551eefe3…

MALICIOUS

PDF

70.3 KB Created: 2021-02-13 17:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 032600e0dd03b78ffad21b594be3fdee SHA-1: e729a6cdf17835165cfcf1d05839672fc1746ccb SHA-256: 57ec72da551eefe350414506781aa96fa6eb9d10c3db9d55a8b4b135b7310f2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a primary suspicious URL being https://druttle.ru/wb?keyword=south%20west%20france%20tourist%20guide, which is part of a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to redirect users to external, potentially malicious, websites. No scripts were extracted, but the overall structure and heuristics suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=south%20west%20france%20tourist%20guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402706/normal_601b2a3f0531d.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/gPihGib/jabavaguruxu.pdfIn PDF document text
    • http://nulonelam.66ghz.com/laferadila.pdfIn PDF document text
    • http://yesitalia.fun/nea_marin_miliardar_film9hq87.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/Y7UHFtk/make_a_list_in_excel_from_unique_values.pdfIn PDF document text
    • http://autobaff.xyz/jegivabidiwug368wn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fcfa4eb8097f.pdfIn PDF document text
    • http://pumexewutide.22web.org/jidonimobemud.pdfIn PDF document text
    • http://pixelbarista.com/zetuxulagiputufekupi8y8mc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/lalumonigifozodedele.pdfIn PDF document text
    • http://mojedebebetum.epizy.com/hardball_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/ben_ten_up_to_speed_apk_mod.pdfIn PDF document text
    • http://fabonek.rf.gd/astm_a106-_15.pdfIn PDF document text
    • http://zijemuviwovo.rf.gd/new_sauth_movie_2018_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/bouncing_ball_game.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 5444 bytes
SHA-256: 9b106cc7dd71e48a367301b35cad59ecfed2fd4f300c451c1a3bcaa7c6369493
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 11448 bytes
SHA-256: 71bf476a29574a59ba7dcf416ad7cf4927369e566294da568ad696470af0a275

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