Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7439710531892a…

MALICIOUS

PDF

73.6 KB Created: 2020-12-23 14:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fd775afebc4a83cb425ef267ec52d5a3 SHA-1: 73be855f71797f5bf8999c809a962c7f6e5a102d SHA-256: 0c7439710531892a0072e680fdbaf14104a38134d6f705e62e869e5f553edf7d
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI pointing to 'trafffi.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document, such as a coloring book, to entice users to click the malicious link.

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
  • 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://trafffi.ru/strik?utm_term=nightmare+before+christmas+coloring+book+pages PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419826/normal_5faafc5fb8a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_5f9e612dab785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459464/normal_5fe2cb3266a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fc2f85a56334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_5fd890b708a1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/keweperadeton.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/parowurusanosozaroparipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8424d1-5a22-4b3d-a3e0-64695962f033/18683666166.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/hollywood_horror_movie_in_tamil_isaimini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a2b257-82e7-4b1d-9332-246b0e510224/snow_apk_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd51cfa-f432-4d14-8ef9-cfcd9dd1bda0/xabivetubog.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/metformin_starting_dose_pcos.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/40437855865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fddf3f-b519-49d4-99ea-8d7a0c8141e4/dbt_diary_card_adolescent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6409095e-02e9-4fbe-a864-9c9f93304408/xokidonurotok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d8169c-afb1-4e2a-a6c3-60a37d5bb935/readers_advisory_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 5392 bytes
SHA-256: 24622e09d19aa760a0dc7687017c6305354864902c2536999c5165d2af47420b
font_01_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 10756 bytes
SHA-256: 659118c65e14439507187d53db3c83cb3bf76a17abe9b514eacd857c70bb5247
font_02_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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