Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd21dd1817a20db…

MALICIOUS

PDF

74.8 KB Created: 2021-04-27 01:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f0a5375003db043e0eeca39eb3ad52d1 SHA-1: 23abe6dcc5a49123f79c0ebbb137c87441f25dd3 SHA-256: ffd21dd1817a20db0e5adff0b4bc48f5942c9e1826285f2aa3f80e7198bf2711
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=dell+2007fp+driver+windows+7+64+bit PDF link annotation
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/lugovililo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_602e44279f2c4.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/uses_of_carrageenan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_6059424fd93d4.pdfIn PDF document text
    • https://nivuvibopaxaji.weebly.com/uploads/1/3/4/5/134588818/zinoziwaziwiwet_vugof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_60609e0095c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_60484aedb9612.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/cuanto_es_1_metro_80_centimetros_en_pulgadas.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/assessment_tools_for_preschool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fdfa701e7b99.pdfIn PDF document text
    • https://jidedenevunuva.weebly.com/uploads/1/3/4/4/134498736/nikija.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/rebesudanolo/campaign_setting_5e_books.pdfIn PDF document text
    • http://suxazetevuzo.onlinewebshop.net/98537031589.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/the_fall_albert_camus_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/macros_in_excel_sheet_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/girl_with_the_dragon_tattoo_2_cast.pdfIn PDF document text
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_69c6e11d85564baa8175b29acd1ae4ea.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_21b332106f7c4ae5b28f745b02a835a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/war_and_peace_leo_tolstoy_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/vitinikuvipugavek.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/69860045429.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/piriralowubipililo.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/internal_auditing_standards_iia.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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 5712 bytes
SHA-256: 8279b3bfa004ce26901f43271d0b635e1edd3fca68b981df4ccb154cec766ba3
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 11580 bytes
SHA-256: 7085c45e6e413e372b29dac28ab92bb6e78a4a283df0ea3e698aef35d9f4cb83

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