Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e7af72e509aad8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 00:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfe63dbd38ac2b6ed884f7fd0935d8ed SHA-1: 6e69745cfab8d805fbf27f34acac1b773b476f37 SHA-256: 96e7af72e509aad81adf18652991a655e98bf2655ba4600ce280b7192ea45829
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple unknown URLs suggests a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://liccuza.ro/stiri_files/file/99045494762.pdf In PDF document text
    • http://softwarefactory.nl/images/file/wixuvulowewujigoviguvomax.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/2554408553.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/dusufasasipize.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///niluxibovaj.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/17182691517.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/maluluvowonesenekadox.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73540549491.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/22173197799.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/74989941718.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/dobegev.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/xenokapojakepewifenuluvip.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/34708818686.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2356286afcd017b577fd4ec54bcfc447/werorolidaf.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/ladafulumupovorafa.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/jozegavugeniwip.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/16957936642.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/guvarumuwamewawegig.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e394a237a7---kabirewebufubuvivel.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/soluxalonepafudosuxajipo.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/betanutulajemovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+long+halloween+read+onlinePDF 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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10312 bytes
SHA-256: a3a82195922138e6788dc092f636bafd491e611667d8cd6a8bf6c103be1c7851
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 18308 bytes
SHA-256: 14bbe9a3f8650ac97f2d69c28bab49922d47b7a3f0d2014bf6236cfa41853746
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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