Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c14f83b4490338…

MALICIOUS

PDF

69.5 KB Created: 2021-04-07 01:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e95f0fedffa02251f75728d75cd15bf SHA-1: 66f7d13a26039943ad31c73becd6077e43fe8810 SHA-256: d8c14f83b449033837694b7eca7b1885daee89b4ba303f1068f6fe89dc910be0
134 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, and it functions as a link farm hosted on multiple disposable domains. The document body, though partially corrupted, suggests a lure related to educational content ('Cbse syllabus for class 10 science'). The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=cbse+syllabus+for+class+10+science+2020+19+pdf PDF link annotation
    • http://cashfree.store/tufatiwejiwifurmdbet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_601a6ca7b7e11.pdfIn PDF document text
    • http://dapibat.22web.org/bilosulavelizev.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/has_the_crown_been_approved_by_the_royal_family.pdfIn PDF document text
    • http://generatorsale.ru/remove_icloud_activation_lock_without_password_2020r1j60.pdfIn PDF document text
    • http://kibiwoki.iblogger.org/chromosomes_and_meiosis_reinforcement_answer_key.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/mureso.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/boundary_layer_in_fluid_mechanics.pdfIn PDF document text
    • http://vikutoxe.iblogger.org/80615182257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484103/normal_60622cf53b60c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabelat.epizy.com/lojugajexurofudajitabuji.pdfIn PDF document text
    • http://lokemupuwife.rf.gd/2577315099.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/ponimunasazuk.pdfIn PDF document text
    • http://goxafebo.myartsonline.com/18870073199.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/crunchyroll_premium_mod_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/easy_definition_of_relational_database_management_system.pdfIn PDF document text
    • http://suzumusazudub.epizy.com/rosazikibopebidi.pdfIn PDF document text
    • http://xapuzafuzokuw.rf.gd/33576689573.pdfIn PDF document text
    • http://vurujixeja.rf.gd/catia_tutorial_beginner.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/tuxukozave.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 5776 bytes
SHA-256: a32bb13e9ee2a69aa0eb9e4619ce7b91609fe2ec1e9408d4ae395fe0b34c09aa
font_01_sfnt_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 10096 bytes
SHA-256: 623ce2cdf81b5b0e7c8a1647c4589718a1e4eaa05b324464880e80159806259a

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