Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5fb4886ae978a2…

MALICIOUS

PDF

78.9 KB Created: 2021-03-09 01:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 601b21d80fdd40fcfe5a47ef35936d3e SHA-1: 43dfed9545b49c1b36e99c7ebf1b11fb4efad0a0 SHA-256: 9b5fb4886ae978a2a3f12bbc592da41d6caa80ce9244ffd695344101e70dfdb8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL being https://midufefew.ru/award?keyword=biozone+year+11+biology+answers+pdf, suggesting a phishing or credential harvesting attempt disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=biozone+year+11+biology+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423696/normal_60008caad4985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365653/normal_5fdd409e44719.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/epsBQCB/cute_fonts_free_copy_and_paste.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_5fe78f323d103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_602990ab82949.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fee9f44c1db3.pdfIn PDF document text
    • http://guvizaw.22web.org/nhs_pension_scheme_retirement_form.pdfIn PDF document text
    • http://nesapumedavemag.iblogger.org/unable_to_insert_image_google_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_602c6289625e6.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/zOXhjha/highway_racing_car_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_602d00e25742b.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/dTHCApT/poxoduvidunud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fe42a15d9c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_603d1cc1f39df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligesetuvijaga.epizy.com/medical_case_study_format_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/jobov.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/asset_swap_spread.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/trane_xr95_red_light_blinks_3_times.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_620c2c25ecd84520a6bb5b96f96c6b7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/android_show_snackbar_above_view.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_be6e93ae167a41f2b28cfca32be91adb.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_5c74011434ae41eeb1c88a5e943b66a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubeto/fupasaweg.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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 5692 bytes
SHA-256: 8cba70b9dcf50577e5c53011e0e8de6ef68db6764614fa7fb6335778626e8868
font_01_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 10316 bytes
SHA-256: a55a4cbb13d4400d296b3f765da3c3bc795a82d7c0d17ba6e517a726234cdb59

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