Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac4224514716caa…

MALICIOUS

PDF

89.9 KB Created: 2021-04-02 22:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0587afe0014c603ec862fe1eadd45356 SHA-1: e5ab79e8d1c33799629747ff130b19132868ab9a SHA-256: cac4224514716caa113727f2e7603b418f7ca14e6ff8b6735823d491e932d44a
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 0.9998

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://fokemale.ru/strik?utm_term=how+to+calculate+shear+flow+distribution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478664/normal_60512d74b45af.pdfIn PDF document text
    • http://beamorem.com/ghost_win_7_32_bit9yn3j.pdfIn PDF document text
    • http://idealica-ufficiale.site/apa_format_summary_examplecfn53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370055/normal_5fee353d7cd50.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/bjhNojc/fortnite_dance_therapy_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_603a9a80cec67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_605389529e455.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/ifmHpJ5/zombieland_saga_characters_yugiri.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/jqtWjhG/acrylic_nail_designs_autumn.pdfIn PDF document text
    • http://bestcreditcheck.info/bubizebazxexsx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_6050b972412e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_2785cfe719924cc784e8ec01d087e26a.pdf?index=trueIn PDF document text
    • http://nefaped.epizy.com/josavixe.pdfIn PDF document text
    • http://fetedifobe.rf.gd/till_there_was_you.pdfIn PDF document text
    • http://mopufeva.epizy.com/singapore_preschool_curriculum.pdfIn PDF document text
    • http://munugarufidapob.rf.gd/after_the_warning_to_2020.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_098ed84ce542498390b9a4fd3a30b20e.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_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 5304 bytes
SHA-256: a5e60fee8fbe8bc5b26fca88daeb2fe22c7e601fc236f1b63922709e3837150c
font_01_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 12344 bytes
SHA-256: 9c8cca2ae0139428ba9024b1d946d3279857c57cade7f3eb28fcf6d0ca3c2219

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