Malicious PDF — malware analysis report

Static analysis result for SHA-256 f356d3d947998fef…

MALICIOUS

PDF

58.7 KB Created: 2020-12-17 08:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9193912b492414b248ab9ba8d5a30690 SHA-1: d21bc83ed2a4deb34ed026159f4cea38a1116a5d SHA-256: f356d3d947998fefcff7d4d785b1260517b7fb5ade25710bda04a379afd8d690
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. No scripts were extracted, but the overall structure and embedded URI suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/strik?utm_term=sansui+tv+sledvd244+manual
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5fa0061fa3bf6.pdf
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/5673050.pdf
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/0bced5e92f7688.pdf
    • https://cdn-cms.f-static.net/uploads/4459481/normal_5fadc2199ae69.pdf
    • https://cdn-cms.f-static.net/uploads/4447273/normal_5fade8e2064cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d9a5f1d-942c-48cc-bd0d-50d67a5b2621/bexawudevijodasiwadezifa.pdf
    • https://uploads.strikinglycdn.com/files/15c97dfb-234f-4204-9cc1-fdcdab8f9b26/the_secret_a_treasure_hunt.pdf
    • https://uploads.strikinglycdn.com/files/b8776333-fea5-4738-b878-a994a4de4180/ditazovi.pdf
    • https://uploads.strikinglycdn.com/files/5282f3ca-c3aa-470b-8394-36a616d47d90/planes_municipales_de_desarrollo_urb.pdf
    • https://uploads.strikinglycdn.com/files/0073696a-5609-488a-8b26-47166f1b2224/52178558706.pdf
    • https://uploads.strikinglycdn.com/files/25bfbc25-a5f4-4208-a617-1210acacf869/avatar_hd_movie_1080p.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_off0000aa8c.bin
597d55557e2752efb90b2554c638446d0b669d893ed8dfc689564a8fa01a9f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8C 5260 bytes
font_01_sfnt_off0000bc64.bin
ab9bf6b48f090942882987dd43149d2fddb15aee3d58692a5bb703c91bff4580		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC64 10096 bytes

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