Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a63528060d9bd1…

MALICIOUS

PDF

72.6 KB Created: 2021-06-12 16:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 773bf649750da8e5575e52bd73eba711 SHA-1: 05ce93087bb8b7550b5336a119eb3c5ee0c0875d SHA-256: f7a63528060d9bd1463818dff0d91ca9778eba5b0edddb312190554a240d3e8f
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution attempt. The document contains numerous embedded URLs pointing to disposable hosting services, suggesting a link farm designed to obscure the ultimate malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://crewmak.ru/pbw?utm_term=download+song+taki+taki+rumba PDF link annotation
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/7b7a90134cb813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fc5fad14a9cf.pdfIn PDF document text
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/redajezov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_602bf5a018a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_60223e7183ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_60bfefaca72dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5ffb681c02a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_603db42913f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_5fd621d6dc848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_600173ee624b7.pdfIn PDF document text
    • https://sujixiku.weebly.com/uploads/1/3/0/7/130739139/3693607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fefbfeccbbb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_601e8fea3d556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_6007c8ab8614f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvudibip.pbworks.com/w/file/fetch/145017801/charlie_malayalam_full_movie_hd_1080p_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0dcfe9-caa1-4c3a-8db1-e0a1b71a81c7/47812118431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a831e9-d716-4052-8bdb-269b7fc04a12/jimipugizu.pdfIn PDF document text
    • http://mavujorar.pbworks.com/f/57672919361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786d46be-71ad-45bc-9bf8-804d305d0cd8/calculadora_de_limites_con_funciones_trigonometricas.pdfIn PDF document text
    • http://lifabukis.pbworks.com/f/66678239462.pdfIn PDF document text
    • http://pewamez.pbworks.com/f/goodbye_krabby_patty_full_episode_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd4e94b-4ce3-4f97-878c-6b36ee361537/sap_hana_administration_guide.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/vegumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ac4eb5-8103-4606-a201-ea0bd6a4d83b/63439646443.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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 5440 bytes
SHA-256: c458936ffb4769cf4b229d4ca10a1a9fe8b955c08b3a58b1848c5bea8d2caeb1
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 10688 bytes
SHA-256: aa8a5c9c6de9ac1f6bd68732007946b54a3be90645763e83e0b7a5af1cd5606e