Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef03a46655f1a7f6…

MALICIOUS

PDF

72.9 KB Created: 2021-02-23 20:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 34a8c1e3f7e188419823c0bd54f9923e SHA-1: 1617740eab00e691fe40d094e26223eca02e24e7 SHA-256: ef03a46655f1a7f65384838498b9bd802f0f861aa1f73bed180c12aa00249ae0
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. The embedded URL 'https://baarspo.ru/123?utm_term=how+to+analyse+choice+of+words' is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. While no scripts were extracted, the PDF structure and the presence of suspicious URLs suggest an attempt to trick the user into visiting a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=how+to+analyse+choice+of+words PDF link annotation
    • http://alcexpress3.xyz/amantes_del_desierto_capitulo_167r1j2.pdfIn PDF document text
    • http://aycotoro5.xyz/borderlands_2_ps4_save_fileyvkof.pdfIn PDF document text
    • http://bestrongbyg.com/34654834242w9z47.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
    • https://s3.amazonaws.com/wulotugadag/addition_and_subtraction_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/kibagoxopen.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/win_10_activator_kmspico.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/34075990722.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/cra_honorarium_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/rokode.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/55806033011.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/33237256205.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/best_chain_guide_for_1x11.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/how_to_reset_filter_light_on_kenmore_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/kixaparewaja.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/75843752864.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/microsoft_excel_chore_list_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/newspaper_between_broadsheet_and_tabloid_crossword.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_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 5052 bytes
SHA-256: cc6a54a19914b9bad34a310b291d31d9e1c53a5aea8baa60ac69084f16ab9ca6
font_01_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 10612 bytes
SHA-256: 48c1178aa8bc17162757c1b03dba969e7ee8d6f87123749e2411180d9ec5e79d
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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