Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55542ca3025588…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 23:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a4677ac37e20784ca765cbfec38745af SHA-1: eea6532cac744d8654945789c0072da82edf3341 SHA-256: 2a55542ca302558863333a1ba1810f35223e5b7dc616d43ac3819d965d19d486
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external websites under the guise of providing information on unlocking cell phones. The presence of numerous external links, including a suspicious one to druttle.ru, and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=how+to+unlock+a+lg+cell+phone+if+you+forgot+the+code PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444866/normal_5ff857636fc91.pdfIn PDF document text
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/goruripulafux-jezovelevade-dinokepofenuxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_60323e619f622.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/6jaibKy/most_viral_videos_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/JzgjIPL/pazirikadogivusajamaxikas.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/gezixizoterinu.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/084b9e8a3933aa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_601c6425540ec.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/325171592d23.pdfIn PDF document text
    • https://gojesewemuvi.weebly.com/uploads/1/3/2/6/132681304/622e7e2a.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/kavupil.pdfIn PDF document text
    • https://xibutunu.weebly.com/uploads/1/3/4/0/134017024/vojazizix.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/kudufigunabi/agent_vinod_480p_movie_free.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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 5460 bytes
SHA-256: 50ae2fb3f27a087b3d75b8ebe80d4e7827bfe5acce9b99a7a5ebe55e7958bcce
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10500 bytes
SHA-256: 897de28e410ecc4b220186a1289ea95e5aa4b2b499c0c01febefaa6ba8a07513

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