Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40f3f0634c3662e…

MALICIOUS

PDF

76.4 KB Created: 2021-05-03 05:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cf6d2af69fbf51867405334453c2cd56 SHA-1: 2b086da0459af85a25a968e434d3a451831c2970 SHA-256: e40f3f0634c3662e7f356d6206d0213036ab3a1036dfc7e47dc6427d41a80c61
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, but one URL, https://nipisod.ru/strik?utm_term=how+to+put+a+chain+back+on+a+poulan+chainsaw, is flagged as unknown and is likely malicious. The document body, though heavily obfuscated, suggests a lure related to chainsaw repair, which is likely a pretext to drive traffic to the malicious URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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 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://nipisod.ru/strik?utm_term=how+to+put+a+chain+back+on+a+poulan+chainsaw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484093/normal_606cb59b0838c.pdfIn PDF document text
    • http://losqutoq.online/what_is_a_normative_question_in_political_sciencel3hwr.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/gokewunedukuguvow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_602c5a8247fad.pdfIn PDF document text
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/rokefisoxoj_reverama_sesap.pdfIn PDF document text
    • https://tafifomoku.weebly.com/uploads/1/3/1/8/131856516/migekapuzuzi_sizobin_vaxarusipam.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/siligom_taxibukafodoji_jazelefuzevuzog_nuxoj.pdfIn PDF document text
    • http://teksalle.xyz/law_of_conservation_of_momentum_sample_problems_with_solutions6bys4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_954a2fc831ca45fe85ae7639872171df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defipedibe/66512778210.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_c90663db6ca64be7a27fd151e5c31116.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/android_os_free_for_windows_7.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_fad581f754554b17b35890a94319d2bd.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_2da1735d68f946caa196cb1517ac9f23.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_c56b39e3cb1d4f9480abcb95e52dfdfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebomedug/cengage_mindtap_answers_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/printable_letter_templates_for_cake_decorating.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4de45f04d33f43e28f44d20d6cd74653.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_d28fe946a0474c0fa374079db95e4806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/wenosakakanipetedixo.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_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 5180 bytes
SHA-256: 7e56ae9bb3a54d4ac6d68d4536d8be6bf102099df4c9aacf473979fe2bf541ae
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 11072 bytes
SHA-256: 564b249873116eeb54f329944f57a622295eacaec1c628e622199856dc19bb62

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