Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2047bf444b04f6c…

MALICIOUS

PDF

98.5 KB Created: 2021-04-06 14:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3d9dd63ff504c8ac35c041f36295f3dd SHA-1: 4104ff6933919ef5140e6f5b41ffb9022d20defc SHA-256: e2047bf444b04f6cc8087ea5187a7271ee634eb8366d2cf1df3c44de345446ec
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential phishing attack by impersonating Yahoo. It contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the final destination. The primary lure appears to be a link to a PDF hosted on weebly.com, which is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/1828030.pdf.
  • 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://soxebez.ru/award?keyword=2020+nfl+preseason+schedule+pdf PDF link annotation
    • http://dipugipedanam.sportsontheweb.net/10859519129.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/1828030.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/23346887822.pdfIn PDF document text
    • http://heleogose.online/257025446805wtar.pdfIn PDF document text
    • http://nikecortez.net/wuterumebuvamivozxf0bm.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/craftsman_edger_blade_guard_replacement.pdfIn PDF document text
    • https://vamububok.weebly.com/uploads/1/3/5/3/135317225/6451830.pdfIn PDF document text
    • http://kimugifogetami.medianewsonline.com/famous_autobiographies.pdfIn PDF document text
    • https://gafogipew.weebly.com/uploads/1/3/4/4/134475428/bapizivuwafulokema.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/6708600.pdfIn PDF document text
    • http://rabota-plus.club/nortel_phones_canadaivt28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_f80240b872b0409a9e7e293e28f8ea66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/1303767937.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_b9b5520585af455cb6e595bef0498b6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/45156956723.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_2b04372721cd4f1d985fe432010e4b13.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_90bce1a12dcd4800a217baa8dc1217dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/what_a_good_introduction_paragraph.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/dna_structure_worksheet_coloring.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/probability_distribution_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/ethiopian_music_video_2019.pdfIn PDF document text
    • http://tirigofov.atwebpages.com/40817161139.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_0a857e6811cc4576ac3c9064633fd516.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_off0001404f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404F 5424 bytes
SHA-256: 9beb2448fdb11e4d7c7be7136851d13d75956a9c9e64c25460d051c662116808
font_01_sfnt_off000152b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B7 11912 bytes
SHA-256: 5f4aa4b4205400dd2ee3c30d62b31107d3c5114b993a5083299d3052d55553a2