Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d6d9c620b94b32…

MALICIOUS

PDF

102.1 KB Created: 2021-09-10 12:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d65ded86c2d1b0785742a2fcc8b8be00 SHA-1: c5c0e4e4dc1119b03df7eb477339522b383f0f1d SHA-256: 15d6d9c620b94b327237c813ae572fbac9bd00a1a9dbeabf7af869d01f3bc7fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by multiple heuristics as malicious and a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://kroonzuivel.nl/ckfinder/userfiles/files/30279571328.pdf In PDF document text
    • https://limberhurstgallery.com/imageuploads/file/80812058370.pdfIn PDF document text
    • http://allier-genealogie.org/File:/45609016911.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/5739306192.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/63555791512.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/fodav.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/5544934593.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbe86364b---1470667217.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/29442953973.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/97927514393.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/juxoguvuluzazo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/86712528466.pdfIn PDF document text
    • https://edgecs.com/documents/64945141659.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/woxaganamanolajerameja.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/73417059754.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/40338446441.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/laripiletaxomi.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/71905374264.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/43707481829.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/29874426288.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/33916152000.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/84972058134.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20935234582.pdfIn PDF document text
    • http://ihdbd.org/upload/files/29852462280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nursing+intervention+for+paranoid+schizophreniaPDF 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_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 17932 bytes
SHA-256: ef80a31f598a27bfcc42dae4919b2fec872ae623483448cb28ece659c34dc79f
font_01_sfnt_off000158a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C0 11056 bytes
SHA-256: a842ce26cb827ffd204c62aadc49624311a2706ce12746e8fe2e225e03ba7f7a