Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b04808a4874ac4…

MALICIOUS

PDF

95.7 KB Created: 2021-03-30 03:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ec58ed95bc5dd623ed98e5b961feda SHA-1: 990eeb5f2d1fd940f4937f0afcb1a1ec1b93dd5b SHA-256: d4b04808a4874ac413cfe68cbe4caf3f9ef0a19aa7fb53991de4e5d778f34426
204 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous external links, including one to 'leonvi.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to urgency and parcel delivery, reinforcing the scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/wix?keyword=listen+liberal+pdf
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fdf1ed787dcc.pdf
    • https://cdn-cms.f-static.net/uploads/4482415/normal_6051f171e212d.pdf
    • http://kovafuwir.getenjoyment.net/applied_social_psychology_book.pdf
    • https://cdn-cms.f-static.net/uploads/4376088/normal_604472d9c4c6d.pdf
    • http://bopugafuwu.scienceontheweb.net/89246674176.pdf
    • http://xubanapirobula.mypressonline.com/what_is_the_theme_of_the_book_24_hours_in_nowhere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83c6573c-568b-484d-9a58-9b231653604c/5511353753.pdf
    • https://uploads.strikinglycdn.com/files/0ea4f600-536e-41cf-9dd4-4a33f1afd7dd/luxosudufiwafojubegonif.pdf
    • https://uploads.strikinglycdn.com/files/47ad9054-f619-4fe8-ae1b-6ebd1a067850/xagavimoxemavabizewoluri.pdf
    • https://uploads.strikinglycdn.com/files/e507ffc8-1221-4933-90ae-730ae2bc346a/buenos_dias_princesa_resumen_libro.pdf
    • https://uploads.strikinglycdn.com/files/8aa778a1-5a3e-4c8c-a276-66cd84c1d744/tovilavutavowojuwigu.pdf
    • https://s3.amazonaws.com/lijopavexanuse/23831953681.pdf
    • https://uploads.strikinglycdn.com/files/f38966b5-5830-4763-9518-9bd4501c67d8/yo_amo_a_paquita_gallego_capitulo_148.pdf
    • https://uploads.strikinglycdn.com/files/8cfb4f65-aac3-40cc-8f55-2ac12600b40d/wall_street_journal_prime_rate_2018.pdf
    • https://uploads.strikinglycdn.com/files/f0caa9da-fd2c-4bc8-9057-ffa4dca5ddff/tuzobuvajilojazalulozefi.pdf
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_35802687a8ce409096ee20dd1a85d21c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da2d09b1-af87-4010-8621-501e33ee25f3/papabogemuleviv.pdf
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_92cfce7625c645b59f4234648b4495c8.pdf?index=true
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_c1dad7f360354168ac86d22690e92d6a.pdf?index=true
    • https://s3.amazonaws.com/bubeto/android_material_design_bottom_navigation_example.pdf
    • https://s3.amazonaws.com/seriposuj/combining_like_terms_using_distributive_property_worksheet.pdf
    • http://jazopizebe.atwebpages.com/am_law_100_list.pdf
    • https://s3.amazonaws.com/zunaporam/budurerotegu.pdf
    • http://liraperuwuw.atwebpages.com/miwitibenatube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001393a.bin
8a2d5fda6e4eae195e2011fd414c3822f8813b972ed58981473877aeb0643766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 5116 bytes
font_01_sfnt_off00014aa5.bin
dbca3368a9314eff6b6cf2d040956c46f8ac99fbc4c2635083d58a65664e1d01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA5 11552 bytes

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