Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e93ff83376c99b8…

MALICIOUS

PDF

75.3 KB Created: 2021-03-27 16:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e7645e8bea40af07d7e40a7a7fa6db12 SHA-1: 7fb420c066a3c5aba48d8e44f68a218e06560fc8 SHA-256: 1e93ff83376c99b8a714d97e8a7b79b8e407a5f22ac08df88568ab2269d4ad95
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious content. One of the primary external URIs, 'https://fokemale.ru/wb?keyword=aprendizajes%20clave%20curso%20ingresar', is flagged as suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan', further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/wb?keyword=aprendizajes%20clave%20curso%20ingresar PDF link annotation
    • https://cdn.sqhk.co/daxerarugak/ig7lsgB/versatile_tractor_lease.pdfIn PDF document text
    • https://cdn.sqhk.co/luluzefob/icjaqhb/ballistic_missile_definition_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/Nighfje/96256586894.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/wupagivoz/20775119182.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_a7534d9d6d784e6c94a69e6ac563f471.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/gaspar_sanz_canarios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b78b63-22b0-44dc-b975-ed8ca58b509c/govenukewufatajenezexumub.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/92610321143.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_aa03599c0bff48b1a6120f76fe50a985.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/rrb_je_old_question_papers.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_de79a20a74ac488bb6db58adcc3a59e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/991b5386-f68f-4f74-b62d-31caa997a837/how_much_is_camry_2020_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/multiplying_binomials_maze_answers.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_26917bff67e34f4ca8e629967333aa64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f2e84f-d2ef-4abb-9598-e2f3035d9286/lagelosokavovutogu.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_86fb2872d1b647a08ef158af6bcf8504.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/749dae1d-f7c6-4d45-ac1c-d197f441f858/the_tragedy_of_macbeth_act_1_reading_check_answer_key.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_c832285a7cd04b15a40ae0870f4736c4.pdf?index=trueIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_68af4c6878b04ec1b6b880bdb5905425.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed2b06a-a6dc-4549-9c6b-241520bf80f2/what_is_english_language_assessment.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_f39603ff688949c0a54166332be51a62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d5fef0-67ff-4b74-bdda-7e91ec3aaaa6/6070294873.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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 5416 bytes
SHA-256: 17c5ff48d10e21c13c6ae54ffd1e9cbc4ea636dddcb69e49c3e06c1858b0b7f4
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 11736 bytes
SHA-256: 775824ac02e8576176b369839e36a75a535ebcb5851376c765be110fd30dd335