Malicious PDF — malware analysis report

Static analysis result for SHA-256 471b4763e5514d82…

MALICIOUS

PDF

78.5 KB Created: 2021-05-27 08:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eb0853575f89f283d6e4af2c4e8cfb15 SHA-1: 2b0e85f5663a054b36f4fae988774748c81cc93d SHA-256: 471b4763e5514d8286069edf2bcb16c98be438a1484c08a90abae74c0566d36d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded external URIs pointing to other PDF files, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary URL observed is https://maypoin.ru/strik?utm_term=johannes+hieronymus+kapsberger+sheet+music+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maypoin.ru/strik?utm_term=johannes+hieronymus+kapsberger+sheet+music+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5ff5b2f731a5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5ffe4f497ec35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_6012791b74efd.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/778b6f5a.pdfIn PDF document text
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/migaginemo-rutubawimawivil.pdfIn PDF document text
    • https://bogimejo.weebly.com/uploads/1/3/4/7/134713861/gimojiwukisisixi.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/vokepanipap_tusubamera_suroxi.pdfIn PDF document text
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/5854994.pdfIn PDF document text
    • https://jafobapobeloret.weebly.com/uploads/1/3/4/0/134017135/dutapixasimux.pdfIn PDF document text
    • https://rexuvaxap.weebly.com/uploads/1/3/5/2/135297240/nawinuverevizatoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fddb47a43ab4.pdfIn PDF document text
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/043edd459668.pdfIn PDF document text
    • https://naworetomepixi.weebly.com/uploads/1/3/7/5/137504938/bixubisevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/995d58f3-1f2a-480e-93c5-f2d16f125bcb/lumupadepile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c526a56d-0c19-4541-bcaf-5663a37e85b8/40927378656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f69e82-c686-495f-a54d-2ca7019a4271/59020812625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6c4f72-6c29-4f50-91b1-84648e704635/assistir_brilhante_victoria_online_2_temporada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24192533-9c07-483e-90d7-2263e0465805/kapifavudadopugib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28cc0ab-3163-43f8-afa2-1475a8bc8e1a/mowewefivudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7620f0f6-6bb8-419d-965a-e1f7db37cb7f/daviwadutikoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ae6c5cd-5793-4944-bb27-c9ae87cc53ac/sokukupuwikikowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c0d704-ecb2-495b-8996-41f724ce11e0/80599490619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c340528-ad16-4157-8812-ca74dc1b9a05/jelavuzivotuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c73d767-722e-4a46-a724-8bd41c96cffa/98227500046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1879ce-48f8-4fa6-97db-fa62bb1d282d/40146909080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e53340-5f81-4e0d-b0b9-eb27f395baa3/xonudidufodapokapo.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_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 5832 bytes
SHA-256: 461d49911ab03c2c64012961111ee6d7dc251d1b7ca78dda32ccf89cdb870502
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 11684 bytes
SHA-256: cdeb3258aeeb967edc281b7a48b7bb5e6e6f01b8cea1330d431c41dc9013f8b4

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