Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1fa4238a2aa1ac…

MALICIOUS

PDF

76.1 KB Created: 2021-05-23 10:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ad0f2e2fbe645e73f958fcaaca70491d SHA-1: aaa4f4e11fa3ff04036fec0704fe91b641e36f27 SHA-256: be1fa4238a2aa1ac7cf2641ab4a08d3e6c5ddad637aae6ce96e210e133b9e9f6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=what+laws+do+teachers+have+to+follow PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490724/normal_603bb68e60f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_602979d0d34ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5fed6bcbd947e.pdfIn PDF document text
    • https://rufufuwoka.weebly.com/uploads/1/3/1/4/131454634/robokunogobovoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_5fd1df53e1ca7.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/bd781a03a8179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_6055bd2c3647d.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/nogelesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_6005e9dfcf324.pdfIn PDF document text
    • https://gonubogebedop.weebly.com/uploads/1/3/4/8/134886664/8423425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_606b6f00e8d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_60382ace2555f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_60552e0fa7afb.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/gozilum/terikidoberu.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/fofojodurofenolij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719a7979-306b-42b7-aa75-b0fc8faf44a9/how_to_redeem_a_vbucks_code_on_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/word_label_template_12_per_sheet_a4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e963a13-9937-408b-bc89-309137c69f6b/how_do_i_reset_the_alignment_on_my_hp_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7d2e90-8ef4-48ad-8232-0f88de1d243b/washington_post_student_membership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03d315e-d64a-414c-97d3-f626bb8d8e6c/35819890725.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_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 5276 bytes
SHA-256: 5f325a3ea6f34a31363ddac90c6ed28efadb3ac9d7db8d554d40c7d377025589
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 10508 bytes
SHA-256: 2067e3b14a5449dcc1fb5453a4d5dc15e995d5cd7852a9f58cff911a0f06a8fe

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