Malicious PDF — malware analysis report

Static analysis result for SHA-256 231b1dab00cc6ee6…

MALICIOUS

PDF

68.8 KB Created: 2021-01-01 01:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 357cb30bb3170b8cc7beb23493bd1a72 SHA-1: 750a09ff06aef58ccbb7322494159a1389f826cf SHA-256: 231b1dab00cc6ee6df51c689219835a65eb1f7d2e7a036e19d6e2d438ea14404
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to redirect the user to a malicious site. No scripts were extracted, but the presence of the malicious URL and the detection signatures strongly indicate a phishing attempt.

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://traffnew.ru/123?utm_term=dbz+team+training+frieza PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5f8e4de584abd.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/mulerux/spiderman_mask_template_printable_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115658c0-43ee-4fa4-b733-36cda3eb7957/sulanotab.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/guided_path_counseling_edmonton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dadaab-8083-4456-bbab-588a4789a595/how_to_read_a_scale_ruler_in_mm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0d54fc-7316-4bb9-9c6e-0cdf05704126/bank_holidays_uk_2020_august.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d30ac4d-4e82-410e-b563-8bf47e75dfae/akinator_app_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/bharat_movie_song_video_bestwap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4d8f49-c34d-4ed1-be1b-b970701795bf/4_year_anniversary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e663e4cf-f52f-44e8-ac3d-c6c74c6e8a90/gekexefir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759e1cbe-fe4c-45eb-a0c8-c62ea5f32340/download_terraria_apk_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56329c26-d066-46cb-9091-9aa35eb5fca8/a_clockwork_orange_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4a96a2-bea2-4b1d-afba-351e5dfc7d13/76876508190.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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 5064 bytes
SHA-256: 51d8df302379194c468eb7c0fa688cd4471ab6e2d0354c472804f813a1061ac9
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 10480 bytes
SHA-256: 27bba10a47fd460f9ff03c3af389625457296e02a573051183a3bfb515557b30

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