Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ab11f51ac82520…

MALICIOUS

PDF

67.8 KB Created: 2021-02-11 10:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fbe5a6cc55bcf0bb469b780891ab83d2 SHA-1: 2ee171af557cd09af87b7bca129c8d2eb4b59e48 SHA-256: a1ab11f51ac82520d56dbae66102a39b3440790b8de68482c7a2e546a1679661
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational content, aligning with common phishing tactics.

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://seumenha.ru/123?utm_term=chapter+8+cellular+transport+and+the+cell+cycle+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5ffd684d96799.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/phn_mm_ct_ghp.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/miajeIo/pusivuzuweweripuvifonib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452373/normal_60053a6307746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366036/normal_5fede5c8af579.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/hhXBjbU/solitaire_relaxing_card_games_io.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/cjfNSic/zixevejukipopurutiduve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fd0910a34881.pdfIn PDF document text
    • http://dutusejutax.22web.org/google_sheets_send_email_on_change.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_600a830c30483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60152c29dfdd9.pdfIn PDF document text
    • https://cdn.sqhk.co/sowumavag/1jg0gdt/83109702265.pdfIn PDF document text
    • https://cdn.sqhk.co/zetarizelub/twijjcx/xisipubazijigerowim.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/jfsqaij/fijidubepavewuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dufijofitaj.epizy.com/52267136151.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 5472 bytes
SHA-256: 1954d86a569be9d98e4deb3de7a487924848f168c350de83ee132ca8b76c03f9
font_01_sfnt_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 10364 bytes
SHA-256: 256fd7ace6dc7c18d62538036ddd253fc343bac9d744a0995bcd9d17ee5f9196
font_02_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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