Malicious PDF — malware analysis report

Static analysis result for SHA-256 13606a74515cf787…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 16:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e770b55865386d098e000bea2d5093b SHA-1: ea2b3b8464cabca3def01c20f696147c639ae288 SHA-256: 13606a74515cf787fde19e02caa381dfdfd69b3e252f79c57b5ad36cc3fc6f8c
144 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The embedded URL and document body suggest a phishing lure related to downloading software. The presence of a password-protected archive lure indicates an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/wix?keyword=gallery+vault+pro+key+apk+latest+version+download
    • https://cdn-cms.f-static.net/uploads/4451545/normal_6047513e0ca6a.pdf
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff6ad036f5ff.pdf
    • https://cdn-cms.f-static.net/uploads/4492240/normal_605926394441e.pdf
    • https://cdn-cms.f-static.net/uploads/4474759/normal_604ef5000ccb8.pdf
    • https://cdn-cms.f-static.net/uploads/4380539/normal_60552e2b88872.pdf
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff5c3f0599f1.pdf
    • https://static.s123-cdn-static.com/uploads/4382196/normal_5fd0308245f7e.pdf
    • https://cdn-cms.f-static.net/uploads/4403954/normal_6041c89b58a42.pdf
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ff277f863028.pdf
    • https://cdn-cms.f-static.net/uploads/4487618/normal_605059a292ccb.pdf
    • https://cdn-cms.f-static.net/uploads/4492246/normal_602810749f88b.pdf
    • https://cdn-cms.f-static.net/uploads/4382966/normal_6048be8e2ea53.pdf
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fd2c05c14a5d.pdf
    • https://cdn-cms.f-static.net/uploads/4366376/normal_600f428e561d7.pdf
    • https://static.s123-cdn-static.com/uploads/4444357/normal_6007fd92185d4.pdf
    • https://cdn-cms.f-static.net/uploads/4530578/normal_604f01fc7390b.pdf
    • https://cdn-cms.f-static.net/uploads/4422385/normal_5fe7785907111.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/veraxawewib/17954593506.pdf
    • https://s3.amazonaws.com/wopari/30526532261.pdf
    • https://s3.amazonaws.com/rovikibixu/balance_sheet_format_in_horizontal_form.pdf
    • https://s3.amazonaws.com/jezobasit/multivariate_analysis_logistic_regression_spss.pdf
    • https://s3.amazonaws.com/sixolose/nms_case_files_surgery.pdf
    • https://s3.amazonaws.com/pisedij/how_to_calculate_cost_of_living_index_number.pdf
    • https://s3.amazonaws.com/nawuvud/45607688030.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_off0000e74a.bin
2c4dd189aed5cef83dc415e8ecf3c1457b7d40f4613325c0481fb8c0f58eed1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 5304 bytes
font_01_sfnt_off0000f982.bin
41ac04413fc548c857ebc6dc80fb09ab11496e8b822d43f0ba3f448c8897695e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 10472 bytes

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