Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c99f855262bf9c…

MALICIOUS

PDF

73.9 KB Created: 2021-04-10 08:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 360f7e5cc0979fde3fa6e2bad179b780 SHA-1: 46a492da8db90e1536715d370727d3c61d7b88eb SHA-256: 99c99f855262bf9c7411cdf40e1f3cf45b7ea8143bf5216111aeab329b8ce304
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=how+do+you+start+a+paragraph+with+a+quote PDF link annotation
    • http://dimozakebaba.scienceontheweb.net/urdu_alphabet_tracing_worksheets.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/78548985105.pdfIn PDF document text
    • http://lnstagramsecurity.net/bumblebee_transformer_costume_homemadep6g94.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/ropiwex.pdfIn PDF document text
    • http://dmdmassage.com/is_a_2002_buick_lesabre_a_good_carmxgkm.pdfIn PDF document text
    • http://novazeku.mygamesonline.org/carte_du_monde_avec_pays.pdfIn PDF document text
    • https://cdn.sqhk.co/fedukifenufu/oid48hd/calendrio_2020.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/18696446212.pdfIn PDF document text
    • http://galoomer.online/dilowac8nme.pdfIn PDF document text
    • https://cdn.sqhk.co/dowamagova/0ibrCVs/toy_race_3d_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_99f7bfc6aeef4853b866dff6c2788bfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/52030033796.pdfIn PDF document text
    • http://tuxodubikanirod.atwebpages.com/economic_benefits_of_solar_energy.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/87563648465.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/gibibami.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/boolean_algebra_in_discrete_mathematics.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_a8a992c80f174e6dabcf7681bfaa90b4.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_94355fde326c494b9a82ff935a37bb38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/why_is_my_salt_chlorinator_not_working.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_aaf22c07fc8149fbae2b49cc693469f8.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 5472 bytes
SHA-256: cff68f9153afebe594e26104e4567436c8a580d559e4d291b13c6eca89e0dcf7
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 10688 bytes
SHA-256: 03f4e6e6275beb095645677417b57057eb6bc0c66530710cff19600bf82ef5e8

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