Malicious PDF — malware analysis report

Static analysis result for SHA-256 8841fb13ec40814f…

MALICIOUS

PDF

103.5 KB Created: 2021-03-14 16:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 623e7afeb4156425a7723c10312f6889 SHA-1: 53827da296d2347e950ac32189f07210d292c8b7 SHA-256: 8841fb13ec40814fc47625052ac45cf2cdbf741e6af9dcf32fd69bf1a48a8644
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wix?keyword=chapter+27+bacteria+and+archaea+multiple+choice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475861/normal_602c05288b232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_5fdb21a9a7401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fe66fed203c6.pdfIn PDF document text
    • http://dopelozaf.22web.org/breast_cancer_ppt_template_free.pdfIn PDF document text
    • http://zenelis.iblogger.org/73332614204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412889/normal_5fcb436545ea3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://bobakazof.epizy.com/ejercicios_de_lectura_para_primer_grado.pdfIn PDF document text
    • http://wazuvit.rf.gd/maggie_and_milly_and_molly_and_may_alliteration.pdfIn PDF document text
    • http://mibaruruluket.rf.gd/70128596547.pdfIn PDF document text
    • http://wepilujal.rf.gd/93265984753.pdfIn PDF document text
    • http://gajiresidar.epizy.com/new_nepali_meri_bassai.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/89518155530.pdfIn PDF document text
    • http://zozezofi.rf.gd/45861567857.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/mijusezikorebubogitute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733a53ce-49e9-43b6-801c-66c733f08932/82928948096.pdfIn PDF document text
    • http://niresadumave.rf.gd/extremely_rare_genetic_diseases.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/ideal_team_player_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/tetufekunevud.pdfIn PDF document text
    • http://netifikapiwi.epizy.com/tasoxujevetokefavabipenaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/ibps_rrb_online_application_form_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5282ec93-f77b-46e6-bb1c-f083deb66b67/sivilevuseva.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
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 5392 bytes
SHA-256: 21dfc8e3e69be9413d93af5a69d13b6b2675777c490d782b5783bd8b230d36c8
font_01_sfnt_off00013616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 21060 bytes
SHA-256: b9025f375002eb81a2d9515c5c134c8f8f2fc737d118e036ee317f3ff9003928
font_02_sfnt_off00015691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15691 10464 bytes
SHA-256: ee7a9a5363f881223c5ebcceac85d81069b8d8959b6ab56b87afcee864c23f61
font_03_sfnt_off00017aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA0 16132 bytes
SHA-256: 82f7aa4fef2cd90733ed84ef1d81c041b15990b82a49830089245cc24b586ea2

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