Malicious PDF — malware analysis report

Static analysis result for SHA-256 0595ad50790c3258…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 14:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b8a0b5978eafc35ef6a5e8107c64ce39 SHA-1: ab8650b7aa5ad89145d59c0fbf8ade3e4989f4a8 SHA-256: 0595ad50790c3258c472248b79cbb520188ac647e4b3eb4315f2d5ac796c8b1b
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, indicating an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

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://midufefew.ru/wix?keyword=rima+asonante+en+versos+pares+definicion PDF link annotation
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/3355291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_6019ccb988a73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5fcee01454536.pdfIn PDF document text
    • http://epipog.com/voice_recorder_free_for_laptopdtuek.pdfIn PDF document text
    • http://good-production20.site/pioneer_avic_x940bto1ss3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ff1ead1d91e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377909/normal_5fc69a6815953.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/kabazojuvawen.pdfIn PDF document text
    • http://sellamorem.com/4200923419476pp1.pdfIn PDF document text
    • http://kulinar2020.site/prosafe_gs108pe_manualz300w.pdfIn PDF document text
    • https://talesana.weebly.com/uploads/1/3/4/8/134878252/a01c957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5346f87c-ffa2-4044-8cb9-768cae709187/premier_protein_powder_flavors.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_918de81dad9649a58cabf856295ceb2f.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_f41488b189f94c6f99ecdf910550e910.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/455049aa-4a8a-4322-94be-d3329b3be166/4136852235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4718df12-7fe4-40bc-a485-51f22a119c44/interview_questions_and_answers_for_senior_executive_assistant.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_b535a09fc5384366bfd43d4d065c8e41.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_b7c278d48b544c938735400d9a8ebafd.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_3efeb62a94ce4f29877003f6e559d4b3.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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 5336 bytes
SHA-256: fcd837c21d3dfdff11898eaa7a1a9cddb7c3ee16254a674e811e353f802771e5
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 12212 bytes
SHA-256: fa7a7de636094eb1058f71631932876fbb9223168bba2ddcccb943dc78a492b7

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