Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f38d94805dbbe20…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 22:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14a0a16d053bf361301d0dcd5646519a SHA-1: 3c3b05fd325cf9a59044f2739d43d1f374dbf420 SHA-256: 7f38d94805dbbe2068cbe5e24e5835543c55f4928e8bc49693b68f1081863829
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=supernatural+season+15+putlocker PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/19bd1c471a47928e0e06513b82e7a0fe/86566913178.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/jizogubof.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/50250758478.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/xakudunofoxov.pdfIn PDF document text
    • http://vuason.vn/upload/files/konajolo.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/50215416266.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/85537854864.pdfIn PDF document text
    • https://reha.bg/content/upload/file/silazilopadikevokusoz.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/bupopowoxe.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/fatinevafemosar.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mivusafemutixas.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8a32330a---gidil.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/53684089599.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/15496377831.pdfIn PDF document text
    • https://sanagustin.cl/files/21554692958.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/81260751150.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/vasapuvukajitesunen.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/4344302802.pdfIn PDF document text
    • http://farmina.ru/uploads/files/39536627801.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/moresazatulisone.pdfIn PDF document text
    • https://bor-diing.com/upload/files/71963748294.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/75314310884.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/zovojizusaredatalevazero.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/973441008.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_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 17200 bytes
SHA-256: a812974acf22c4a21a940df93642171cef20c3f926b39d022da5ee9c38ce7232
font_02_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 10728 bytes
SHA-256: 39cb05cb7e1503729dcbbdba914eaeb438f2c4bf0cdd302f55ddfad7eb6fd6db

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