Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b4f60540423c4…

MALICIOUS

PDF

74.9 KB Created: 2021-05-17 23:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b39e08d57684c5413c9706ef53df221a SHA-1: 060cbe2905a5d78b6cd5f8329940f3d3349a4937 SHA-256: 8c1b4f60540423c4dc39e3b9f65f4b694f3ecbd2c2ce6730b059375a5244a2b1
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URI that points to a potentially malicious resource. The ClamAV detection indicates it is a phishing trojan, likely attempting to trick the user into downloading a secondary payload or visiting a phishing site. No scripts were extracted, but the presence of embedded URIs suggests a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cdn-cms.f-static.net/uploads/4390995/normal_606c9aef6f961.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4494429/normal_60079a202bc72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5fe1044d36b25.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/b3acb5b4-60f7-4272-a11a-7781e15e3fbd/how_to_record_a_sale_on_account_in_quickbooks.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/speak_now_2_workbook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf23966-646c-4b85-bf63-f01696266cd2/mxr_10_band_eq_sample_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2c9128-422f-4a4e-9a8c-67cc26c47128/120073006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6984b5f7-cf33-4a35-9764-a420f647ea2f/pepalixuwoxefitej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9895bf-beed-49c9-94e3-c2daa4f69527/essential_air_fryer_cookbook_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/craftsman_41a4315-7d_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4fd8a2-34c7-47b1-a48c-b2b37002868c/dell_e6410_drivers_bios_a09.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/kumado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790a1982-a234-4c37-a09b-0d42810582c4/taxaxajomadafezaxuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73d8434-3c9f-4fa9-981f-9aff89bed921/medidas_de_block_de_concreto.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/xanib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00849c14-3fbe-4a6e-bfb7-31ef3e014e45/68784515935.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/acute_decompensated_heart_failure_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/xugog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1317c897-94aa-41e9-b57d-b26179d68ea5/garifevobanusaruw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4678836-83df-4b80-97a0-a4fbef8bc8fc/girl_with_the_dragon_tattoo_author_books.pdfIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=multivariate%20analysis%20of%20variance%20PDF link annotation
    • 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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 5620 bytes
SHA-256: 9dfcef612f486f74b5f5de193e8d99ed65073746a78a918f4c51b9ae78a8c1f9
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 11204 bytes
SHA-256: b4360e35a1dee967ca28a8f018ec98a0c5940312d7390dff7c35042c1795f33b

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