Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dda02d4e42bf8c…

MALICIOUS

PDF

78.1 KB Created: 2021-04-04 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 933fdf49d77189466563dab31d83d715 SHA-1: 3ba950442474fc7b8655d774d48d7ce200458af8 SHA-256: 55dda02d4e42bf8c03e469daf2cad7009bec03d9a76fef9ddc0adcd10c247e98
96 Risk Score

Malware Insights

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

The file is a PDF document that contains a lure related to a tenancy agreement. It embeds a URL that points to a suspicious domain, likely intended to host a malicious payload or phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/123?utm_term=non+assured+shorthold+tenancy+agreement+template
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fe8f2f574568.pdf
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5feaf17277cdd.pdf
    • http://titanovyi-filtr.ru/quantum_computing_books_20192374g.pdf
    • http://digitalmedialit.com/5268945767jgzp8.pdf
    • http://roman-holidays.shop/29795323261pubvd.pdf
    • https://cdn-cms.f-static.net/uploads/4371020/normal_60286909ad290.pdf
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5fcc3091ebecf.pdf
    • https://cdn-cms.f-static.net/uploads/4387702/normal_606776121c47f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d8e3943-709d-44dc-87c4-40152fdb9a43/vanus.pdf
    • https://uploads.strikinglycdn.com/files/bde8dda2-cbc4-4f57-951b-163dd2104982/80732354048.pdf
    • https://uploads.strikinglycdn.com/files/06c3113e-7890-4fdd-ab44-7cd0c18a73d1/classifying_triangles_according_to_sides_and_angles_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/505b87de-d6b1-4f3d-961e-5f32f01d01df/26164680526.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/sample_email_requesting_information_about_a_product.pdf
    • https://uploads.strikinglycdn.com/files/a73ea3a5-8472-4fb1-b83e-270ed28dd323/23071219444.pdf
    • https://s3.amazonaws.com/fejakixoweka/what_is_the_difference_between_diamagnetic_and_paramagnetic.pdf
    • https://uploads.strikinglycdn.com/files/ea9d6fc0-1e86-4d78-8036-246ecbd68e7d/mackie_control_universal_protocol.pdf
    • https://uploads.strikinglycdn.com/files/bcec4e02-1685-4a92-adf7-401b15b13296/jesus_camina_sobre_las_aguas_biblia.pdf
    • https://s3.amazonaws.com/dubiditiginowo/14995830851.pdf
    • https://uploads.strikinglycdn.com/files/29fd7880-5925-493b-8c12-24f5471af447/90635277568.pdf
    • https://uploads.strikinglycdn.com/files/d915f664-5997-424c-83b7-c3d4900b27a2/4130283921.pdf
    • https://uploads.strikinglycdn.com/files/458b405f-df4f-4f94-b0c2-8854e16c9c9a/megipumudoxolojixik.pdf
    • https://s3.amazonaws.com/supefujoxopubu/agriculture_tax_exempt_form_new_york.pdf
    • https://s3.amazonaws.com/dorulusof/37995288835.pdf
    • https://uploads.strikinglycdn.com/files/57e81b67-71bd-4a18-820d-671836e5324a/70201306216.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_off0000f3b3.bin
a63f8b1278b1bfc741e4a62d74a549c7acc56cc63b45fd21d92a3bf6cffaa261		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 5556 bytes
font_01_sfnt_off0001067d.bin
a67d01e98b0d127a147f4d4bdcf9e1750d87c0c7fed3105a14a77634c12772b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 10516 bytes

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