Malicious PDF — malware analysis report

Static analysis result for SHA-256 814753322c1dadaf…

MALICIOUS

PDF

88.6 KB Created: 2021-06-03 06:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e04f802c7fc3530b095ef68eee4f3ade SHA-1: 2e29dcbcc78bee6f6ac0b82e08ecae0245e5916b SHA-256: 814753322c1dadafaa2152209011d66a04113845dcd8d0f2b1e9dd4ccd8cfdb4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF functions as a link farm, containing numerous embedded URLs that likely lead to phishing sites or further malware. The presence of external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious destinations.

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://ketchas.ru/pbw?utm_term=unidad+3+etapa+2-ws+%25233+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389354/normal_5fc951a0486ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5fe24be137d08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_6014bd74b2683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_6010b716f11c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifilipisi.pbworks.com/f/nitewodexirib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144a2a95-2990-4771-ae4a-6aacd2820d45/harry_potter_goblet_of_fire_watch_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f631444d-5513-43a6-9dd7-63ed70a5b059/emr_hst_diagrams_april_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03a2983-845e-4b8a-98f4-55ebca6a779c/manigepuxagajekugezakuliv.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/f/how_to_create_a_shared_drive_folder.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144455442/89390771800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6dcbe8e-1b29-4003-8645-5f6e684d7a51/keurig_k45_elite_brewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e585bf-285d-4a1a-921d-fb9959fb0e93/how_to_franchise_kung_fu_tea.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/w/file/fetch/144459915/15762894791.pdfIn PDF document text
    • http://veweran.pbworks.com/w/file/fetch/144457530/the_pythagorean_theorem_and_its_converse_worksheet_with_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5202a3-0110-422a-88ee-bf8f47264078/ginujifugilupumiwosomibem.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413832/76217963152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e82bde1-4380-4e17-ad64-97e6f67101ce/zuwugowafotofigudimiroku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5246db-e97c-444f-8032-2afe54d13dae/active_and_passive_voice_rules_for_interrogative_sentences.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/padamibux.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/what_happens_in_michael_vey_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28b9659-5748-4a8e-8cec-483f5324a587/zosokusikimonupuz.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_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 5236 bytes
SHA-256: e7930fd8a023de4f3489f55ec709d7d094dfb23268417131b5ce7219d221ee18
font_01_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 13188 bytes
SHA-256: 35046c6e8355587356e3b337bdb81992ecf845115c4c94784ba403949f84b74e

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