Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75ed5f046c6c3f6…

MALICIOUS

PDF

75.1 KB Created: 2021-09-23 07:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f2a1a2b0a6b1d273712b0964f0caf25 SHA-1: ba603f2b9a68d208801d43edcc938d05e720236a SHA-256: c75ed5f046c6c3f678cea63226487b630e7e15551413e4f2078da6f8865b05cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this PDF is part of a campaign to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=android+application+development+for+java+programmers+pdf PDF link annotation
    • https://kit-veron.my/ckfinder/userfiles/files/jepijimezupuxug.pdfIn PDF document text
    • http://humanlitech.com/files/files/21053510756.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/lugewubujaz.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/75967322852.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/zenito.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130e1678b41c---kagoxozimovusop.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/15830911630.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/85230886790.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/41408837932.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/2414936862.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/10931818934.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161404ccf187b0---31409597916.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/xesuwunorevuwom.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/pukukobudigof.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/kepedofezovik.pdfIn PDF document text
    • https://olterus.net/contents/files/dakemenataxogatavipaxog.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jurasemoza.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/97303939562.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487ce33cbd2---3546925041.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/39850655177.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/7303315816.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/nazageposofagekibeline.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_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 11140 bytes
SHA-256: ced0a7857bfae46390265ff06ba3b3f619f385e6cc32530fe446628d207ae3d9
font_01_sfnt_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 16672 bytes
SHA-256: 122e06bca98292acf9c38b6ba92674596074569a584f3454a871b790a8eab60d
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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