Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd10924c14ddfea0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 12:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8fc491c09c439ccf12bad83d3282d081 SHA-1: bb5985fe663c8496e7b2b0af65b199023767619d SHA-256: dd10924c14ddfea077de5ee8dd618f4e5e4d09ca2e291cf5eb130674815417e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=how+to+make+space+in+internal+storage PDF link annotation
    • http://mobilahomedesign.com/userfiles/files/99069873601.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161361edd1a783---fojasejiwipowomirawazo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395ac9ee521---dowoxokafilarisituji.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/xunilotexetum.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/ramanevokidi.pdfIn PDF document text
    • http://lgassociates.in/uploads/67857635027.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/38897079895.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/64499530871.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/96382882992.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/mipediwuriwuzaxomukusek.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/97115339645.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/31333536373.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/10801075294.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/zexisoxirosap.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/bumazuwoko.pdfIn PDF document text
    • http://rotang.net/userfiles/file/tujexuxibe.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/43133245119.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/pemufidodiji.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/zelinetugozedupeluvivasa.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/11755251859.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/5565621453.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/89643629864.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/zugoxoxogewifu.pdfIn PDF document text
    • https://fultoys.com/userfiles/mikatemeto.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kugikelujoretexulaziwakuv.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_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 18424 bytes
SHA-256: da2c11e639ba0cbe58df570232be195e836d62d23032825417aa34c8591870b6
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 10888 bytes
SHA-256: 7bad58ecd77b993abf00c89d48f9149c6b74057797203a1c72e378e5d8ad3f4d

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