Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50986ec494d0efe…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 10:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8cb6bebd599b5f3daf02a999fba6a0e2 SHA-1: 23b679839cb599a5543ba426de9b0f80b4c35ffb SHA-256: d50986ec494d0efe5a0cb7ccb9d66e5c0f42a2c0c2774e9c5b09a78d5c1d7a71
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=remove+clothes+apk+free+download PDF link annotation
    • http://sapientgenerator.ru/files/userfiles/files/35816763861.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/zudujux.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/39898131657.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/vixopodugewixodexu.pdfIn PDF document text
    • http://grimastone.ru/files/sizetu.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/vumubowugudakox.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zobotedadefadidojeluwumuk.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/kisefumapiramurokibel.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614787e336d93---26359246582.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/83385433207.pdfIn PDF document text
    • http://apvn.info/userfiles/file/35004708617.pdfIn PDF document text
    • https://shibbirs.com/media/files/robinomuxuzuzut.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/dofevot.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lidonalobozatuwuvasetawe.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/17159047400.pdfIn PDF document text
    • https://nistd.in/userfiles/file/19605780619.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/40cd031982c5874632e0249c0519b957/49499556605.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/pufuvobapogoxijowavexe.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/kimibuvoxewipodi.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210923043147.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/nikotesapidilobitazumopid.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_off0000ae1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1B 11084 bytes
SHA-256: 5ecbf69f75e41086d176698a2fc83e43f615240b27186babf9f313b1f2adb226
font_01_sfnt_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 15704 bytes
SHA-256: 13c80f8d275da54bdbac25235d08996e73d606aff7fb06ab192adadc46a05bf8
font_02_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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