Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2d5f91fdd8128d…

MALICIOUS

PDF

69.2 KB Created: 2020-12-20 06:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c559af365dbe0261fa89bcd97320fc8c SHA-1: 7349613c413f37fad614f9085732fcfa8169f9d7 SHA-256: 9b2d5f91fdd8128d69a534e89d43c89bd5fb185dcbe86ce570b55bae32117552
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result, which is a common social engineering tactic to trick users into visiting malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL confirm that the link leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=how+far+is+400+meters+in+steps In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f8d41b2b3626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fdbf526f3376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5f9dfb9666582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_5f9839715147f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fcce24f7697e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fbd14073a96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f9c6c12702c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fdc336bd1786.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/2f409154-ba3d-47fe-9dd1-8a360044f909/bloons_td_battles_hack_apk_6.1.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed66c0ff-7077-4fa6-bf2f-bcf5dde25320/exponential_function_worksheet_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a6a249-ea5b-4703-99e5-065a312f256a/mawobet.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/kukepewowo.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BD 5296 bytes
SHA-256: 8eb9ad9355a8146126f0db23983848f2515ed489620a72ed64ba457124edc2e1
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10332 bytes
SHA-256: e2e22a7cfd02bec434a6ff6bdfca3f3bb8addb72e31b41dcf0283c297fc916e6

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