Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d928a11bb16364e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 15:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 499dda70861d2feacf1b7596b0534b46 SHA-1: 468075e172c9dee51c664cc760292caa4f7fa85c SHA-256: 4d928a11bb16364eacbb9cf73bbf501c5f867cc201092391d8d9b1b2e8ff4abe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0ce6ea46---wijodadipega.pdf In PDF document text
    • http://sreema.org/FCKeditor/file/52065619927.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/99414458757.pdfIn PDF document text
    • https://phukienbep.net/media/files/31698516967.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/58141676912.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/wexewizurogatijo.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/tebejusemidurir.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/23298397233.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/mukupadubuto.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/mabovomikamokofebobix.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/pixegov.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zaxuditigikeporaramixi.pdfIn PDF document text
    • http://gysanya.com/upload/file/210906194654318090bjt19urmt809.pdfIn PDF document text
    • http://humanlitech.com/files/files/tarurosida.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/84166659943.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///35867924935.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/90979922452.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/25661893940.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/davovil.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/jiwunokizi.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/mapagavumanuzurozisemod.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/fisusaxila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=adding+and+subtracting+vectors+worksheet+answersPDF link annotation
    • 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_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 18588 bytes
SHA-256: 43de44c96247223d43bcc796bc619b7739bf0c7c0a54309decd3434bd4b7c899
font_01_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 11068 bytes
SHA-256: 3ea410e82a2e0f49f61e1c22c12d45f60c38022bc11087623484c7fe6d587ad9
font_02_sfnt_off0001388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.