Malicious PDF — malware analysis report

Static analysis result for SHA-256 a818b62a14c91880…

MALICIOUS

PDF

68.9 KB Created: 2020-11-10 14:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b47838709175c6f198852356cf7cbdc SHA-1: 10e6196f6f1e00953949d3a9711ce8442590714c SHA-256: a818b62a14c918808bd7f981ae1121c877381e1e3a4c201a25a612583a6e89ad
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 URL points to a known malicious domain, suggesting an attempt to redirect the user to a phishing or malware distribution site. Although no scripts were extracted, the PDF structure and the malicious link indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?keyword=how+to+make+your+leg+hair+grow+faster
    • https://nodudoweg.weebly.com/uploads/1/3/4/5/134599631/3bff1723a0f.pdf
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5f9f92c052cab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/henghuili-files/55664052272.pdf
    • https://uploads.strikinglycdn.com/files/bbfae368-990d-4215-a4a8-fa5aaa699a30/photoshop_selection_tools.pdf
    • https://uploads.strikinglycdn.com/files/248c13b8-3843-490c-b1f2-cd6c62ee3b17/pugoji.pdf
    • https://uploads.strikinglycdn.com/files/07b5fc92-d70f-4254-8f61-c93ea8054e13/zanovakoromemawif.pdf
    • https://uploads.strikinglycdn.com/files/94ed7dc7-7874-4569-abe6-441075dc36ae/libro_de_espaol_secundaria_primer_grado.pdf
    • https://uploads.strikinglycdn.com/files/e8ea4aee-d6c4-4f7f-b81f-cecbda2e1212/68861515608.pdf
    • https://s3.amazonaws.com/xanebavifamopez/kptcl_recruitment_2019_notification_in_kannada.pdf
    • https://uploads.strikinglycdn.com/files/1c62ac9d-8d49-4621-a23d-002a8e4ece1c/jirevelez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f7.bin
ccc23e1f35d536d619aea6b025d332433a594c50208efbdddd02c68871785d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 5176 bytes
font_01_sfnt_off0000d5ab.bin
9a7651e7d04f855aff250b6c0e4fd2893d7e7ccb9dc3805cd2430012741e8ca3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10420 bytes
font_02_sfnt_off0000f8ff.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 4324 bytes