Malicious PDF — malware analysis report

Static analysis result for SHA-256 52eb755c1acdac8f…

MALICIOUS

PDF

72.2 KB Created: 2021-06-12 14:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6781f04e746df1cabf11a0a9781e297 SHA-1: df0bf72eaec7b9bf10159ba8062caa55b5d7dfca SHA-256: 52eb755c1acdac8f36a668a13b7e43a326917c786fc3cdf094f9431e58282f1b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to present a lure.

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://queure.ru/pbw?utm_term=how+to+draw+fox+easy+step+by+step
    • https://cdn-cms.f-static.net/uploads/4420014/normal_604de0edc28ef.pdf
    • https://cdn-cms.f-static.net/uploads/4370288/normal_600db910c14ef.pdf
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fc7aba93a3b9.pdf
    • https://cdn-cms.f-static.net/uploads/4477877/normal_605d0a940b25b.pdf
    • https://static.s123-cdn-static.com/uploads/4465907/normal_600432ad8e5ff.pdf
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5ffdffeee7544.pdf
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5fca7cc86bafd.pdf
    • https://cdn-cms.f-static.net/uploads/4494139/normal_603c3d6da88a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dimutojopog.pbworks.com/f/soxigujo.pdf
    • https://uploads.strikinglycdn.com/files/3b7b9f80-de05-4754-a030-b2ffa9e89c16/hp_designjet_500_wont_print_with_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/3d1ca810-330d-4ff3-8dcf-b701e5dff652/how_to_replace_pressure_cooker_sealing_ring.pdf
    • https://uploads.strikinglycdn.com/files/018f4ee5-8ebb-4ebc-816f-b87807985343/dell_precision_t1700_ram_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/08e0f674-a5ed-4065-bf32-28fcef2c14cb/doll_house_act_2_questions.pdf
    • http://zexowisam.pbworks.com/f/how_to_open_stuck_sentry_safe.pdf
    • https://uploads.strikinglycdn.com/files/7d1944b8-cbc5-4eb9-a0f1-970c245609a9/can_you_lose_weight_with_p90x3.pdf
    • https://uploads.strikinglycdn.com/files/40a23908-1c0a-45d7-8347-d0be3f0c6ca9/axiom_air_49_review.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_off0000de11.bin
430082f47452294feebfcb823dc51d9850ee9ab0324264754e47ad38e10c2c84
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 5368 bytes
font_01_sfnt_off0000f074.bin
1f2dd80c73f1c001b53649b3cbf2ad8dc160994c9edfdc83768301efd47ec08a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10360 bytes