Malicious PDF — malware analysis report

Static analysis result for SHA-256 db58d8ffb7e55362…

MALICIOUS

PDF

74.8 KB Created: 2021-01-02 12:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7474227994ee74cb23e48f3b6763cca6 SHA-1: 77c315c082da88d784971f40c1cc35a18ec5d7a1 SHA-256: db58d8ffb7e55362fa5395a3fa9c52c0395d7bbd8087c6202545e960ee3e7f01
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://ggtraff.ru/aws?utm_term=weekly+grammar+worksheet+commas+12+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5fe8902f19114.pdfIn PDF document text
    • https://zatitudebijozi.weebly.com/uploads/1/3/4/4/134460539/tiguj.pdfIn PDF document text
    • https://likivaduzizi.weebly.com/uploads/1/3/4/6/134699319/2256245342.pdfIn PDF document text
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/6239770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5faa579c5606c.pdfIn PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/fibolojafixabanan.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/gajakelegeza/fun_alphabet_worksheets_preschoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a93b6b-87bf-436b-a58f-7510b339fb19/fsa_geometry_eoc_review_packet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2472f31a-20c6-4033-88bb-652fb5a1fa5b/mifenuvulozupanad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909538f2-fdbb-4bf4-b6e6-5511cabacf5f/gamibokes.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/9496786045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cb80cb-cda0-4454-b757-09b1799919d9/99610250273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25918551-94a2-4306-aa96-e9e32ebda4c8/sugalil.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5668 bytes
SHA-256: f3955a6c9e79ec7716c5d0d9c10441cf24ff8a39698fa531a7ccc08089fe3ecb
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 11248 bytes
SHA-256: c6c46794be65c96719afba3443139e7d26b96cc933a49e33ed376d0c529982a5

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