Malicious PDF — malware analysis report

Static analysis result for SHA-256 c446772863cd1e41…

MALICIOUS

PDF

79.7 KB Created: 2021-03-09 04:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e0f0b4d676d21436c362a0fda4dc204 SHA-1: d0443e90a31d439bef12180c7de4548382cadbc3 SHA-256: c446772863cd1e414217e996c737bd4d5fbd3e46ebaf5968621c62475c42c98a
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 indicating phishing and Trojan activity. It contains an embedded URI pointing to a suspicious domain, 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'La caida del muro de berlin ensayo pdf'. No scripts were extracted, but the presence of malicious URLs and the high ML score suggest an attempt to trick the user into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=la+caida+del+muro+de+berlin+ensayo+pdf PDF link annotation
    • http://buylettersonline.com/161640722796n1z1.pdfIn PDF document text
    • http://dalnoboyi.xyz/irregular_verbs_spanish_meaningpm5o7.pdfIn PDF document text
    • http://presentinsta.site/194317392566ch6b.pdfIn PDF document text
    • http://lozhobelir.space/513525309742tn1n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_60359cbbb6c83.pdfIn PDF document text
    • http://uk-delfin.ru/32303240820camde.pdfIn PDF document text
    • http://buloshnaya.site/xafirixanuwakifuvinpyv2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_60382fc27b706.pdfIn PDF document text
    • http://mirror-x.org/6844161297xix13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_602d3cf0c1ca5.pdfIn PDF document text
    • http://chelamela.org/what_is_a_classical_physicswoyjw.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/taguxif/33099213733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e4a4a0-23f4-49e6-9c3d-a3fd8a5b2073/guxozupilupunasov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b18bb4c-354e-448c-ae34-e633fc795cc2/gijaferojik.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/56535215047.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/jaxefipovijulawitinoneku.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/26339412232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a554b3-a6b9-48c9-8d28-38cbb30a8593/how_to_install_sirius_xm_tuner_in_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bc3ae0-f083-4b2a-9990-8b38eaff299c/curso_online_gratuito_de_marketing_digital_de_google.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/ap_biology_exam_review_packet.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/cc_link_ie_manual.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_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 5484 bytes
SHA-256: 614e98bbb29d960514598e6a3a231347d0ef2a54a9f43b6fbd286ed4ff93eaf8
font_01_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 11316 bytes
SHA-256: 8e0f7f581c779e68863b7cc819f376054940503d90750d859e5c103e4884daad

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