Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f09b72af2d3969…

MALICIOUS

PDF

76.6 KB Created: 2021-01-03 12:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 976df6a7d7519f035471f3eac6bf453d SHA-1: ea5632df2491fe1a09b4b44dd06b4df7007182b5 SHA-256: 05f09b72af2d3969322b2b6d23d3f2d38befa4948de04c77bea14de846cd614c
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for a malicious redirector link and a high-confidence ML classification. The embedded link, disguised as a book download, points to a known malicious domain. While no scripts were extracted, the presence of a malicious URL and the overall classification strongly suggest a phishing or malware distribution attempt.

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://cctraff.ru/aws?utm_term=amazing+english+books+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5f928aaa8b32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8a5c8e7ccef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f9f688fb61ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fe45e4f23082.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/jeih3Zz/35868810069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5f9932df31087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f88af3141757.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/f9642e5a-1e83-4bfe-b624-1f253dbc1f57/super_mario_world_switch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/jususamamo.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/lumax_industries_ltd_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e5e1a2-5cd3-4a23-945d-2b1adbae6a23/run_steam_vr_games_without_steam_vr.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/jewonano.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_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 5604 bytes
SHA-256: 9cda816f3a60ccf4c710a0089109c9cd025bb6594f4b2f73570111094ee89296
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10408 bytes
SHA-256: cc9cbebd86002e4c4a20d1a01a5b9a38c4e84acf0a56517f0c47130e7f08b8a2

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