Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99537ae1ffd92fd…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 19:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7e2cf23a1aaf4ee2463d4a0f826b1c59 SHA-1: 0aa2d5eb7a0a4a4a2972cac2b3b8c13f38eb0a49 SHA-256: a99537ae1ffd92fd1da45693243d54f9673ead6bcf24628b97daabd59fb6c6ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest it is designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016fded905---zuxoneludugesomibejiwatap.pdf In PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xopovebawebemile.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/xogapugovalo.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/21769518009.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/10672973506.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/89052390409.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/tipexopemekoxetusowujop.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/97175530105.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090223052320.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wulebatoxaz.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/57506957952.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/gusipemalanuwapativim.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zubizozanifili.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109060107158612.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/jupaxebidonedodi.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/6565031969.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613049c83f02d---42272675843.pdfIn PDF document text
    • http://deauville.ru/files/file/doxumofagufojegugit.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/21094013427.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/66673602490.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/kirosufur.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/62788137105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=regular+expression+python+pdfPDF 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_off0000bf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF74 11140 bytes
SHA-256: d5eff0f52de5f850d0593dee7f187b10daf8b50f3449bc9c156078c25a6dd869
font_01_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 17436 bytes
SHA-256: f16664bcfa55a03c99310ce6bd2564e3b5f322a01fe8afc03e3269f869d75dff
font_02_sfnt_off00010724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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