Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ab81507ff1fd95…

MALICIOUS

PDF

89.3 KB Created: 2021-03-15 09:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0a6f3e44db4f5266458fc951d4d58748 SHA-1: 6b9361d22f0cac4b1392f5bc36e26b2b5a6f1e26 SHA-256: 66ab81507ff1fd9589da624b6f19e3af78cf5d4941b955f14fc62fbe2fcda21a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'student manual'. The presence of numerous external URIs, including one pointing to 'seumenha.ru', indicates an attempt to redirect the user to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=byu+new+testament+student+manual PDF link annotation
    • http://solent.bar/fitiweriwexudekugazexokuaypzj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_6046829044d11.pdfIn PDF document text
    • http://fimosabu.iblogger.org/vupawofolibuniboj.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/1998076003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fcaa0bb3224e.pdfIn PDF document text
    • http://salearea.pro/nilopojuwurukojeguwewed5oerq.pdfIn PDF document text
    • http://nekevofitoruzat.22web.org/write_chinese_characters_with_pinyin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_600d002075703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_b0c98576d32248729cd991f77b3f6ec7.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_5c7d52b74c1b4d7d802cd94ed9da29ef.pdf?index=trueIn PDF document text
    • http://ruredat.rf.gd/how_to_spot_human_traffickers.pdfIn PDF document text
    • http://dafiwogi.rf.gd/bach_well_tempered_clavier_sheet_music.pdfIn PDF document text
    • http://pitefabe.epizy.com/math_minutes_7th_grade_worksheets.pdfIn PDF document text
    • http://vaxutere.rf.gd/how_much_do_foster_parents_get_paid_in_texas_2019.pdfIn PDF document text
    • http://dipuvomefig.epizy.com/11771121800.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/21625206175.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/rocketfish_wireless_speaker_kit_rf-whtib-a-c_review.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_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 5116 bytes
SHA-256: fa247fbcba267e6bfafb17c8216ca53196d1fe33c940e6ee6600af3b9ee0b668
font_01_sfnt_off000131f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 11288 bytes
SHA-256: 5ae6627ea8be748632261b2cd314e6f2ebd2e0e0bb62c0e3c07b5ce73d3cfd92

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