Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef43aad6e9663b30…

MALICIOUS

PDF

73.2 KB Created: 2021-06-11 02:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 58f0e4b7e2f321609e8ceda5c2aca624 SHA-1: cc4c44f6fc41d15900848e1ef236757e3c6b4bee SHA-256: ef43aad6e9663b306aa632be1e66e29440894fe215686c74eded3397469ea662
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that leads to a site offering game cheats, likely a lure to direct users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/pbw?utm_term=gta+sa+cheats+xbox+360+cheats PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446772/normal_5ff4c226e1242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_605d541a37dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_6044d1c2a22fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_6032c67ecf7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_603efdc83bbcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_6048df49c6dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6014449a29a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_60b86ce185edb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcf381fabf8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_603be51cdd99a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_5ffece94469b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_6025baad057e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_60123243c053c.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/7ee79c17-6fe9-4a67-a298-4354410b46e2/how_to_get_my_eyeglasses_adjusted_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ee30f8-61d7-492f-ada2-d24a2abd39c1/69857440351.pdfIn PDF document text
    • http://wotetidi.pbworks.com/w/file/fetch/144836739/2005_toyota_4runner_scheduled_maintenance_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e705fa2-d91e-44d1-9e1d-3f531380fce5/lajawilagujalitevova.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/how_many_litters_can_a_american_bully_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b3f712-27e9-4934-8c94-523eb7d00803/sereraxulogewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53bbacb6-a78a-4593-b062-94e853eb6fab/34029993558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1181f2be-7c02-41da-97e5-46116d443227/shatter_me_lindsey_stirling_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42c95de-7a15-4114-b8a4-3426f554ef33/how_to_interpret_gdp_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc69e48-9b41-4bea-a943-53fe51ab9f2e/xozarelotoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66755bb7-7838-4db5-bc9d-fd19afcbda10/can_u_put_vitamix_in_dishwasher.pdfIn PDF document text
    • http://guronavageba.pbworks.com/f/fovipilutifogof.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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 5456 bytes
SHA-256: ae7ba7d612aa3da757ac48fba40bb5bfa7c3f734497b2050245a941305d05201
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 10856 bytes
SHA-256: e4669e0289e7a5fa83d73afebb1fcfeb20fdf1b7fa20be33d394c975a4fd41a2

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