Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f49553059c5335…

MALICIOUS

PDF

114.3 KB Created: 2021-04-11 20:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2d6e1aed2707e51c074856ddc8633396 SHA-1: e317c3bb239e0ee349609b90d7ca6dc365468502 SHA-256: 23f49553059c53353093acf8be82d63af9ecf0a93ae2e339c31b3b58c06c1bca
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'Fender mustang iii v2 firmware update', likely a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=fender+mustang+iii+v2+firmware+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370267/normal_60535be83d9f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5ffe27a1cbdb8.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/1667567314.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/free_niv_study_bible_download.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/whats_in_the_sky_tonight.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_c4040a2b5c9f4093a1c1d7be09562e93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genijusemu/25872301452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8be4a2-60de-4273-a443-426e4a1ff1ae/ejercicios_porcentajes_2_eso_con_soluciones.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/how_much_to_lease_a_2020_lexus_rx_350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f874d4-89d6-4792-a92a-1b79801ecd03/8608103786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6cf1bc5-7ebc-40bc-b5ee-0d3d11319856/7984368397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf3678f-34ef-425d-8951-8d73500434f0/device_to_remove_excess_water.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/addition_sheets_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f119d2f9-ce51-4617-9ed1-769d4f74405b/descartes_meditations_1-6_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/tiguwaxomof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1667cc-cca7-4f9d-92bc-2d96793d70f2/41393690012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6098da-dbba-4ac0-8919-a26834c66c34/4137765226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01c35d7-8d16-4435-bff4-efa82538f079/modelo_carta_gantt_excel_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00997887-d565-4678-ae0c-b993d2e61cf0/joletidododamogerivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53bd44d-8218-4f15-8975-c78673335712/1_to_100_in_spanish_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/menuwuju.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_42e3de809e2a443997cee31d7c0fb7d0.pdf?index=trueIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_da405e8e733042c1b8bcd2a60041f196.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_65434f1e34ea4203b62d5814863755d0.pdf?index=trueIn 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_off00017da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA6 5568 bytes
SHA-256: a6ee2bf172da6e98f02c7fd525e2fb3cd8765cff9387f0bb770b09176539f5d3
font_01_sfnt_off0001909c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1909C 12104 bytes
SHA-256: 0a83a623e1bde1fe2c774747564a3963cbf6c993592ca488e6cd4f85c2dba410