Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc998e13fed1aa5…

MALICIOUS

PDF

76.0 KB Created: 2021-04-07 11:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 036468ce79433118080a427501d34f29 SHA-1: 7224ad5fe84e5da1110ecaac3b8990b1b60cb011 SHA-256: 2fc998e13fed1aa5adff58ce9ee538701f54db42b00a1f2b171d399b9e440af5
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-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://zajinet.ru/123?utm_term=landline+telephone+bill PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449170/normal_60308ee558531.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/mzjhHhe/sexuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_6057f6cd556a3.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/irhRigF/poetry_define_ballad_stanza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_5fe7d72c1a8dd.pdfIn PDF document text
    • https://cdn.sqhk.co/xosuridasago/gxijhgz/67140690256.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/data_structures_and_algorithms_in_java_lecture_notes.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/21517209958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_600baf3bf3185.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzudumijamo/Lo1jhrJ/83747907289.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/a_travs_de_mi_ventana_libro_descargar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fcee6c03506a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_600d17d341703.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/gdotUjb/classroom_screen_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426071/normal_600033cf22938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_602d6370c84db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_5fdc272e0c812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penale/computer_explorations_in_signals_and_systems_using_matlab_2nd_edition.pdfIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_3b89ef1537664391bc66951df989adc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/aurat_foundation_report_2018.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_8441cb936d4a466fbb6946cfabc3b6d1.pdf?index=trueIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_f6dafeea45f849998e25eeddcc3715ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/89432315569.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/angular_reactive_form_dirty.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/kixumezupefuvo.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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 4856 bytes
SHA-256: 7101919855229316582be83390a3dd9955b4aa9f0f45de77519f0cc5baf98c93
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 11468 bytes
SHA-256: db201c7180a5d5223f482f224919363e1ebec815348efeb2e0f9fd6fb6a8f5df

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