Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ace9605cd8fa5a…

MALICIOUS

PDF

81.2 KB Created: 2021-05-21 15:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4bcbf8f9c87e30f9436540de72c3faf0 SHA-1: 204d0b78315cbce799f8e63715820c8253a1ae3c SHA-256: d4ace9605cd8fa5ac38615435b77d4180f314385ac406708db315639178f4a84
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick the user into visiting a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=letter+writing+format+for+absence+from+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421778/normal_605490eb941dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_603df2ebdba46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_6015bf745569c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_601c797e2f49a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_6051402550c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_600c9e7e4b6e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5feb7664cd128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_6067f4f55512f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_60468dd748b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414498/normal_60248c5b89563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_6064d837b1555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_60176a796dbba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_601598456b423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_604ca8ae8459d.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/e997331b-db07-4610-87ad-455085a22275/can_i_get_hbo_max_on_apple_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6ccdce-1172-4b94-a94a-239ca9c77323/is_niagara_falls_ny_open_covid_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6736e374-884e-48c6-abbb-7de659bde14c/how_to_fix_gas_grill_igniter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1018fbb-3c8d-4941-8b9f-67d3f255bff9/50284626243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd939a6-1c42-44ed-b7db-1877af26553a/are_washing_machines_worth_fixing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254235e9-5a3b-499c-964c-a71102946e98/84546832098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa5b3a5-1956-4629-ac82-16f2f46afed1/54787679255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc164167-4d83-4ca3-92e1-d7897b68da14/big_water_fish_market__restaurant_siesta_key_village_sarasota_fl.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_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 5468 bytes
SHA-256: 2344a4b3af512dc16a9c0a2b8143082f43745416b1345cc9ca2f80568e13db59
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 10724 bytes
SHA-256: 1231afdc48363bd438b0e44404736f609b9987982c2305d52eab597d306ef13e

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