Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2038e5409a9397f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-25 04:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 662f5a5aa7dcd460ae4fb1a4682f8a1e SHA-1: 39e371771ca7520b7f0d4cc91102e4545c90ba45 SHA-256: c2038e5409a9397f44c8641f1bf77c673da985e972d511aa24baf75674f054e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/jibifabuxaxeruvanak.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/dc51a82af452b7189f54477c731bcbec/wamowutulose.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/ledinamajojajosogabib.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/rawomagom.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/17784302771.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/96211237450.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/79770424541.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/limuwipipazege.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/kidanebaporunutomekaw.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/taxogupuroni.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/wowituf.pdfIn PDF document text
    • https://hoalavender.net/upload/files/44531559839.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/56009272475.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/68364259175.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613697c4b1cf6---82000987044.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/76650338255.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/luxel.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/jomezedamaxijexexamigaba.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/88935133896.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/gopafazikoxekasanumewopo.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/76910679917.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xirazozunefefopupudat.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/dibusubivifatab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=it+comes+2018+full+moviePDF link annotation
    • 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_off0000bf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF02 10752 bytes
SHA-256: 5e7f3a78fc260ad6832480c1e5a7967a03f1e2527e8fc04fce5dd442de1879c4
font_01_sfnt_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 20168 bytes
SHA-256: a9e61a617a22910919cd693e382093875893d447424fe7eba8b87aca8616b37a
font_02_sfnt_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1