Malicious PDF — malware analysis report

Static analysis result for SHA-256 acddf1d8a0e68664…

MALICIOUS

PDF

118.0 KB Created: 2021-02-14 22:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3d66d6c97833d9c7ed760b9bea63e8b4 SHA-1: 7e6d36bce5b2712f37aa70084e120fb6eaacd236 SHA-256: acddf1d8a0e6866479d290fc5d3bb3053b18a12279a6db4e42186797dfb6b3ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a significant number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users. The heuristic firings and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=hair+cutting+machine+target PDF link annotation
    • https://cdn.sqhk.co/xituvusaw/egjUwge/zazafudomubelo.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/shggiZA/thoroughbred_alta_loma_christmas_lights.pdfIn PDF document text
    • http://navaram.online/bolexutovemah1qxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_6018baa5b2bf2.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/661087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480579/normal_5fc8d503bbc72.pdfIn PDF document text
    • http://segikusi.22web.org/animal_crossing_hair_color_guide_city_folk.pdfIn PDF document text
    • https://xoruvuxana.weebly.com/uploads/1/3/2/6/132696063/fugaba-gipapemidet.pdfIn PDF document text
    • https://wosabawa.weebly.com/uploads/1/3/5/3/135390578/xoligivudotufi_luwubiratuboxix_zofibuj_tomivew.pdfIn PDF document text
    • https://cdn.sqhk.co/koroxofusino/2M5hie1/94869286102.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/OjeCSyB/ups_hub_goodyear_az_phone_number.pdfIn PDF document text
    • http://boliwamipo.iblogger.org/27395096887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467979/normal_5fc99f234e323.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/Kk6higc/60s_70s_rock_music_videos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5fc8c2e1e1171.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/Aii3ige/pixelance_apk_mod.pdfIn PDF document text
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/2510279.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/sivazelowuxubemeja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000192d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D8 4964 bytes
SHA-256: f3d8c158e28fa76641d46274c757cdbddf2a5d08f49a21a56c0622e7a0c96a63
font_01_sfnt_off0001a394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A394 11496 bytes
SHA-256: 3547337fefe8745a4a0e01b04f32e1ab857f2e80cadf8e2a85efd3bc3b885fdd

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