Malicious PDF — malware analysis report

Static analysis result for SHA-256 392fafb81abf44ac…

MALICIOUS

PDF

67.1 KB Created: 2021-10-01 10:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7aee41a937d6d45255329694921a162 SHA-1: 55e46e6669abb34dc3015a850c77323d3a085757 SHA-256: 392fafb81abf44ac7781a14c006eccdde7eb16e8f250f927af2a070028ab1ef7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://rallstarawards.us/nbloom/fckuploads/file/wadaxokutuvumuvo.pdf In PDF document text
    • http://dajuicebarus.com/uploads/files/nivawibebilisojufo.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/49617773420.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/2701557633.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/mavogedapolatusowewefon.pdfIn PDF document text
    • https://htchninc.com/d/files/bejotilodavotasepukitawu.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/29682984080.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021092415090170554.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16150602b6aca9---wonimifekapowus.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/61936140769.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/vafufavisolisalu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/44192834806.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161537c1724648---retetadowubevesosu.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/58601356902.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/82360494986.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/20463326544.pdfIn PDF document text
    • http://all-premium.com/user_file/files/sudekuzojigekasu.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/77848553469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pdf+opener+apkPDF 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_off0000a974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA974 10180 bytes
SHA-256: 2638cbda941db7140642ac904d6300b786e28c4d3fd4c611c4edff0860f1bdd2
font_01_sfnt_off0000c04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04F 15756 bytes
SHA-256: acc40feec43d2f719e0efcda76c19ef5ad6f5d13cdac0b3106e515f596fde85c
font_02_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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