Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7c8a0bd9974113…

MALICIOUS

PDF

75.3 KB Created: 2021-05-29 04:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dee3b57c6cc161475a547e6323a2b11 SHA-1: ddcadcca65939a98b0dd14f8ca02991b1e0605e4 SHA-256: da7c8a0bd9974113731fa242c0ff98ebb4392070b0e1a81e58c443721103fc80
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs to a suspicious domain, identified by heuristics as an external URI and flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, contains text related to a printable ruler, suggesting a social engineering lure. The presence of embedded URLs and the nature of the ClamAV detection strongly indicate a phishing or malware distribution attempt.

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://midufefew.ru/strik?utm_term=printable+ruler+inches+and+centimeters+actual+size
    • https://cdn-cms.f-static.net/uploads/4404290/normal_600cc377c4a28.pdf
    • https://static.s123-cdn-static-d.com/uploads/4370072/normal_60b047155eab4.pdf
    • https://cdn-cms.f-static.net/uploads/4373769/normal_6037a8c8eb404.pdf
    • https://cdn-cms.f-static.net/uploads/4422136/normal_6047898517198.pdf
    • https://static.s123-cdn-static.com/uploads/4490736/normal_5feb87c68b5b5.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5fd12e458b832.pdf
    • https://cdn-cms.f-static.net/uploads/4367627/normal_605011d21b412.pdf
    • https://cdn-cms.f-static.net/uploads/4452372/normal_606c33d2d951c.pdf
    • https://static.s123-cdn-static.com/uploads/4492875/normal_5fd042e49ef2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ecc4bf51-ebad-44f0-b76b-b5c5702b5935/lirexe.pdf
    • https://uploads.strikinglycdn.com/files/4dc3c370-c1df-4a4e-8bee-d36b28c456a3/pokemon_silver_walkthrough_kanto.pdf
    • https://uploads.strikinglycdn.com/files/b811203f-d8cb-40e6-957f-ce4285b3912f/tugomesisixirilor.pdf
    • https://uploads.strikinglycdn.com/files/28d46b04-7753-4ece-a3eb-df27acf85114/samsat_hd_2300_mini_prix_tunisie.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ee.bin
44dd7935f1d5f8a7d5a00ccf5d1fcb0236cc52a4066a01eda6c88b6b52a4da42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 5372 bytes
font_01_sfnt_off0000fb02.bin
2da2d024786c4a2d0ad4d68cc977a1537d1f0ff07569b5c235edd899245fdf65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 11060 bytes

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