Malicious PDF — malware analysis report

Static analysis result for SHA-256 20037909a0ef41ff…

MALICIOUS

PDF

72.1 KB Created: 2021-02-07 18:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ec13f43de4ecfb7f7976cee239ee813 SHA-1: ca836ef46fa48693e4ad23630e398dab3037e894 SHA-256: 20037909a0ef41ff3ef82a1e389d598f6477bd34613ef5e6e1a070e8f4f06e06
104 Risk Score

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://baarspo.ru/wb?keyword=free%20printable%20letter%20l%20tracing%20worksheets', suggesting a phishing or malware distribution lure disguised as educational content. The presence of multiple unknown URLs further supports the malicious intent, likely for downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wb?keyword=free%20printable%20letter%20l%20tracing%20worksheets PDF link annotation
    • http://birjand.design/john_l._truyensf16c2.pdfIn PDF document text
    • http://fewipawesedases.iblogger.org/9544406882.pdfIn PDF document text
    • http://badgesverified.com/87867308046vg0gx.pdfIn PDF document text
    • http://bas-vorota.ru/75454814472rcuz1.pdfIn PDF document text
    • http://apparentlyopt.com/theories_of_performance_elizabeth_bekbn5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe6e032ea92a.pdfIn PDF document text
    • http://hurricane1.space/bsc_agriculture_subjects_notessrcu1.pdfIn PDF document text
    • http://classkaod.ru/61999627089da8pd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5ff80e2ba0a7d.pdfIn PDF document text
    • http://limecash.xyz/fakamigarap8x0mu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fe1618d86393.pdfIn PDF document text
    • http://rodsfish.club/96971499434o0u6k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425919/normal_5fc7290abd51c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/c_elegans_life_cycle.pdfIn PDF document text
    • http://siloxatomikuje.rf.gd/91586310350.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/b_ed_form_2019_lucknow_university.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/sexipuroxusewijale.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/porujof.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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 5444 bytes
SHA-256: b1633fc0c5d2b8cefe502aa6f2d9cc4f80b235fab3163e34940304cb9aa2cf95
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 10492 bytes
SHA-256: f1c7297c730d0f314e431cb8ade33d2fecf42e9d734bfdc9707dda032b00f159

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