Malicious PDF — malware analysis report

Static analysis result for SHA-256 c063abb7510028ba…

MALICIOUS

PDF

206.5 KB Created: 2021-05-24 11:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5e89258907088b213a5f9582f7a2c9fa SHA-1: 282b51000d29a0c41e726a2e900da4850579704e SHA-256: c063abb7510028ba4b7fe8a4386aa25664066da9a6fec81c72a341e0757439e5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL, https://dafemum.ru/strik?utm_term=englishman+in+new+york+alto+sax+sheet+music, is the primary indicator of compromise, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=englishman+in+new+york+alto+sax+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_60623b2774d74.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/doromi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fc75227273ff.pdfIn PDF document text
    • https://puxugewukuniw.weebly.com/uploads/1/3/4/4/134492634/kodeseni.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/9329299.pdfIn PDF document text
    • https://fisokupavunimi.weebly.com/uploads/1/3/4/4/134469682/e781ec84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff97181e3493.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/daadeff690.pdfIn PDF document text
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/niwaxuvi.pdfIn PDF document text
    • https://gofubemasuxa.weebly.com/uploads/1/3/2/7/132712405/aa1843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fe8ad0a83f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_604fd0ec24de3.pdfIn PDF document text
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/4468382.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/xapidajovaji/nevaxuwasifitezafoxigur.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/berea_ohio_police_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed44c17-10a3-4198-baea-071878716844/scag_tiger_cub_deck_belt_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/45372917639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39df42ca-4eee-4fbc-bd3c-4b416557a98a/que_fecha_es_domingo_de_ramos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbaf58b7-e927-42b1-a72f-fff083903500/jovupafizonawuxaxekagodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0664e5d6-8ee3-4ed0-9a60-0c48ebd88f11/69642496752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f681623-ae52-41ed-bc89-7c1b72e19ae3/24438207322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d802ef1-5d9a-4447-8e6d-a8247b5d8b7c/how_to_reset_2012_toyota_camry_maintenance_light.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_off0002d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D902 5580 bytes
SHA-256: 0a8a26b80f436d299d44877a5c20be80ec45228fe9070d34a30f1a979976d983
font_01_sfnt_off0002ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC39 5496 bytes
SHA-256: 5964e5140bf1f3a9fa1f983d4d1417cfd3da967e01357a1056e9aa5759e4b996
font_02_sfnt_off0002fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEDF 15568 bytes
SHA-256: e34980d22076563894d100c1661d0e731c34c895a7aaa036a64de4a8a13906df

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