Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bac3a47f0f545db…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 16:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd9ad6b284c4e3d22c66f26ed4ef2a6d SHA-1: 0f331287d2e2e683b6d2ed529460386696b31e31 SHA-256: 3bac3a47f0f545db6fa9c0325de29ac881f96db3ef0ccd77aea8ed7469291c44
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and is identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=ps4+remote+play+portable PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310724f3021---30751057512.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/jezivejewejisoru.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/40259722532.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/95951692719.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ripifotigujijorolusevi.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/zuluw.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d1e79eda418fd5a7ae5d459fa3432eb3/41000973799.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/wojelezowugononeref.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/daresetu.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/jupujimabi.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/32011158873.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/jododa.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/muzudigimemoreliperufatit.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/92172857584.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/budakanifurepojiz.pdfIn PDF document text
    • http://guchen.ru/d/files/24448167824.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/ronotatiwivizad.pdfIn PDF document text
    • http://aimic.com/userfiles/file/95364087869.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/bujazuvuzosafanelutowaxap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462abf87eeb---69936667044.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/61086816495.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/97577743235.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_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 17972 bytes
SHA-256: 364707509af9dd474207c8966fbf5bf47138c9e3ccbc74e74950e511f37e2f2c
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 10548 bytes
SHA-256: f73ee67b4a7b21ba2bacecf0b00a2b0bbb249889461e98ce3ae2896189ac8225
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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