Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd241d1d0efb24a8…

MALICIOUS

PDF

73.6 KB Created: 2021-06-13 10:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 62413d60bbd4f25a2615aada41ca365f SHA-1: 6449473afdc511314d233d481c1056abfb0ef8c7 SHA-256: cd241d1d0efb24a8ce4bec4c6c3593699e67b6510ec99c7532ab603d657b05d7
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to 'Ant video downloader android', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/pbw?utm_term=ant+video+downloader+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481985/normal_60017167a2dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_603a9a2892e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_605b420e32338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379500/normal_5fdd952751487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_603865f4b6dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_606de20ea7a87.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367013/normal_60afe8e3cd90f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_6003e0a742fa5.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/26f86917-1065-4ee0-ace7-ce5de1ee4471/basic_electronics_course_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da4eb83-9809-406d-9341-ecb2956e8c2f/64783811418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404db0f4-d196-4e4d-901b-4230c2ba9314/flowchart_template_word_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba8bb14-d5b1-4085-b61c-00363aa7bf64/lumutepugosumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a392865-5570-4622-90bf-335a0beaaece/el_profeta_khalil_gibran_pelicula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdf4ff3-c2f5-4bf6-8097-2aa083e8d7eb/execution_the_discipline_of_getting_things_done_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbf860b-71fb-486d-8b2b-170db689fce0/2500_in_1960_is_how_much_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d040da51-a135-4b72-bba5-4532ed28483f/pofimudusewosukowaxukada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455ec176-14ce-4159-88df-29eeb214d732/hp_officejet_4630_printer_not_responding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefb38ac-f461-4856-8281-ff62f16b52f3/zugoseravex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0f4831-4325-4ea5-ab04-a90b0b19821c/zizefunedokuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027adc9b-c6ca-42aa-ac1a-c56ddef90754/what_is_the_definition_of_critical_thinking_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313167cc-90e3-4fcf-8d8c-ba8ebf0e0693/66673018699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96f9ece-3fee-4cf8-9bee-5333963438a7/88965074533.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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 4784 bytes
SHA-256: 80505008e3f0ce1cbdebe5d7d3c671fbea97066cbcc720ce4410a29a9b791f02
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 10240 bytes
SHA-256: 1ab6dba3e9809fca8b07ab88507cb811d7cba749946ad53314960d99ae772017

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