Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4f499905b51680…

MALICIOUS

PDF

67.2 KB Created: 2021-01-04 18:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 472f02bdfeb840dd8b9026b41b5743eb SHA-1: 7352bdf753cc4b899083b7ef77700b262580f0b1 SHA-256: 9c4f499905b516802047f3112b0cca2bf3517117ffaab165d212eca210195323
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, suggesting it's used for phishing or malware distribution. The document body, though heavily obfuscated, contains text that appears to be a lure for free song downloads, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=gudang+lagu+123+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f99895302c1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5faf4f3a0255a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_5fdc5d00a2c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5f972b0d7a933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5faed99a8bff8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_5fc531584a293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5faaec79d1f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f8e5d6268774.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/tonemakopinibem/uhc_prior_authorization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/dorper_sheep_for_sale_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/absolute_value_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbeb6c0-26ce-41a2-92ea-9021166cbd5c/oak_leaf_id.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/mixifob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3d1f4e-22ab-4c32-93ae-abeb292951ca/21244082300.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/class_12_maths_probability_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/android_one_rom_for_mi_a2.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/cesarean_section_journal.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_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 5372 bytes
SHA-256: 07a1df732fab058fb76a58c86f8355b331fcb70c67f285af1398933e609ba2bf
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 10940 bytes
SHA-256: 71298510c0618199e7aaf128c09ef19fc0f3f8a193583d24648275a7c2ecf60e

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