Malicious PDF — malware analysis report

Static analysis result for SHA-256 067587639f6b4164…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 18:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 180b00f7484b15c5873c9aa739ecf39e SHA-1: cf58a8dc336d11acc9d01cf5aae6a21f61f866ca SHA-256: 067587639f6b41641af26b5b19563f5d7e6e50a682bcf89835d2f7c37d2ac5b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=bury+me+my+love+apk PDF link annotation
    • http://personnelstrategies.net/userfiles/file/nalaf.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcba115ddc---kigadevexenoki.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/8894301599.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bunedunapexukozap.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/xupaj.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/dujikoreda.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/96025766817.pdfIn PDF document text
    • http://wirheiraten.de/images/file/legoza.pdfIn PDF document text
    • https://togeltop.net/contents/files/39684627395.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/20240194257.pdfIn PDF document text
    • http://dobermanncz.eu/files/97438828830.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/vejarifupodovijak.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/borogevafu.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/71923084304.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/37067274743.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/35876493545.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9270a5480cf5e7c3d8ce9f0a913e0399/kazenowozokodaratufupixa.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090912334161.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/vasuxuwupazafi.pdfIn PDF document text
    • http://moristas.com/userfiles/files/tobusatu.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/texova.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/rusus.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_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 17992 bytes
SHA-256: 17486b52faab827bfe65511133afbd2ba449c9e309c73625c4ea22d1dfdaff0e
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 10376 bytes
SHA-256: f77d5808f184774df0b3c3a9fa4431b5159ba5f125953d83f0f44766e515eb67
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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