Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4bf275431f42c9…

MALICIOUS

PDF

77.6 KB Created: 2021-03-25 08:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84e5d600444b0516c2c7766d5a45b890 SHA-1: a5be8502b1ea5c2b35e7f3772f8a93b71378e320 SHA-256: 8c4bf275431f42c9c29d90f0b80cd3da195b4bfe04fe1365ed2af2293cee9321
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'fear of falling scale' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=fear+of+falling+scale+pdf
    • http://basepati.22web.org/nalekojaba.pdf
    • https://cdn-cms.f-static.net/uploads/4446038/normal_604650e03eec2.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_602b63a39323b.pdf
    • http://vuxiparami.22web.org/backup_android_apps_es_file_explorer.pdf
    • https://cdn-cms.f-static.net/uploads/4373778/normal_604d912e69a07.pdf
    • http://dofitodisibo.22web.org/viwerusagapaxok.pdf
    • https://mefusinumobidal.weebly.com/uploads/1/3/4/6/134679396/daxoti_jojar_weweg_memoz.pdf
    • https://cdn-cms.f-static.net/uploads/4445321/normal_6009c28f6aeef.pdf
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ffcc25de6a53.pdf
    • https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/xozogejefebokuzoka.pdf
    • https://zesidorav.weebly.com/uploads/1/3/1/4/131437831/9638875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://birijigasexow.epizy.com/v_p_l_ka_full_form.pdf
    • https://uploads.strikinglycdn.com/files/bd81782a-f79a-472d-9279-e2f397002a44/review_label_5_whisky.pdf
    • http://gabepan.epizy.com/58193886941.pdf
    • https://uploads.strikinglycdn.com/files/aa3f5dd0-d2ca-4ff2-b146-eaea58e4e0e1/how_to_scan_legal_size_documents_on_hp_officejet_pro_8600.pdf
    • https://uploads.strikinglycdn.com/files/2e3f5454-59f7-4a87-86e9-962055026663/10493901400.pdf
    • http://lesasesodimavun.epizy.com/dstv_guide_ss3.pdf
    • http://riwasepe.epizy.com/xudugamowuxowo.pdf
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_dc0fc020fd084ad092a4503bf371e71d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a1db001-d6f6-41fa-bbae-daf6b4f97282/how_to_install_tp-link_tl-wn727n_without_cd.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_9d517bb86cc84454a0b161d0e3fec568.pdf?index=true
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_d051aebeff0f4ad0b8e83f4c87fcd038.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f312.bin
31fcdb5d0184d877cd83a10f69abdc62a1d8f399343c728d6bbf6f07449e1aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 5276 bytes
font_01_sfnt_off0001051e.bin
95fb51e4016a341bd3cb793639b98fa8199d1ac50ddbb06b23254a50beea6c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10660 bytes

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