Malicious PDF — malware analysis report

Static analysis result for SHA-256 5beaa405e74b7e3e…

MALICIOUS

PDF

78.1 KB Created: 2021-04-28 06:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6dee3c8df76b3fcf7c209046834d71c0 SHA-1: d3420e80b3e5ccff1283c5f66402f4a91293f5a4 SHA-256: 5beaa405e74b7e3ec7bd3c932f80493915a18626182efba2acb4e1716093c402
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=imagenes+sistema+endocrino+y+sus+partes PDF link annotation
    • http://homebig.space/32923020313bkzd3.pdfIn PDF document text
    • https://nukukenodaxuw.weebly.com/uploads/1/3/1/3/131384044/4071264.pdfIn PDF document text
    • http://fojefefipo.22web.org/jubetuxunobave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_603cf179e8161.pdfIn PDF document text
    • http://nelibagaxo.iblogger.org/65007818189.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/c6268386f29.pdfIn PDF document text
    • http://bodegumuxizobi.22web.org/51590176560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_606ea8939ce32.pdfIn PDF document text
    • http://limecash.xyz/cheat_sheet_meaning_dictionary19h4n.pdfIn PDF document text
    • https://kewenarizifosiz.weebly.com/uploads/1/3/6/0/136092989/e603c1831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6015aa61576ee.pdfIn PDF document text
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/8884586.pdfIn PDF document text
    • http://kebosukav.22web.org/ximovepiwuvobigitewevaxup.pdfIn PDF document text
    • https://fotavimapuwe.weebly.com/uploads/1/3/2/8/132816041/xalabojafubad_jowotubifarulat_kemolifo_senowezetuduxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufibilola.epizy.com/jorep.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_89c3d8dd6d064585a34285ae2925e01b.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_1f5eb63c6c484e64b9b786e8ff55d739.pdf?index=trueIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_2f54dc44bac6421b88cbe4ab58f79b26.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_40f640accc5c4488ba0db8d3dc85aa39.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_f7505814b88845bdb735a7cd4ee83fc9.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_ad0cdedc23294c25a0028042fff72f84.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_69a88806a74a4fb5a5bc7ffc08250913.pdf?index=trueIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_c98f59742b0942b699f5da4dbc194022.pdf?index=trueIn 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_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 5400 bytes
SHA-256: 2a603e00d64785babef25e91ca29cc2c15ee4755b2bcf1594be49fced955ed7c
font_01_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 11048 bytes
SHA-256: 7a5ea6a23b7cde709d747e62dd56389a65bc04a7b511fbef6881160853095864