Malicious PDF — malware analysis report

Static analysis result for SHA-256 913689e8949ea632…

MALICIOUS

PDF

80.7 KB Created: 2021-06-09 01:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8e6d7953d4afbed8896aee7cc32d1794 SHA-1: 33f31f96fb4a49a512fd7649c97059d7e2a60a8d SHA-256: 913689e8949ea632418ff4becc737b33ae93bf3a10c117bb21f58115ea890a2d
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded URI pointing to 'https://crysiq.ru/pbw?utm_term=how+can+we+find+atomic+mass', which is likely a phishing lure designed to trick users into visiting a malicious site. No scripts were extracted, but the PDF structure and embedded URI suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/pbw?utm_term=how+can+we+find+atomic+mass PDF link annotation
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/rowokizona.pdfIn PDF document text
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/4446358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60694b8ad16aa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368747/normal_60b65d70e4c93.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/junemofa_sifavojil_vonafu.pdfIn PDF document text
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/tinobakar-sunurisan.pdfIn PDF document text
    • https://revanesowokaw.weebly.com/uploads/1/3/4/6/134652238/lelunebizeralumov.pdfIn PDF document text
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/visivutusewonave.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/9131543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7cd3cc39-cf21-41ee-b8f2-11c69dc52280/presonus_mixer_ar16.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144476001/ejemplo_de_observaciones_para_boletas_de_primaria_segundo_grado.pdfIn PDF document text
    • http://pukagij.pbworks.com/f/ghost_in_the_shell_full_movie_download_in_hindi_filmywap.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144568614/how_to_care_for_barefoot_dreams_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12046f12-d5b5-4b5e-a4e0-51fe3842a625/nojefovozorikisi.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/vajaminegadamanajat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1deb5dab-9d11-4b8c-a1b1-95b478c4994f/dulak.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/w/file/fetch/144654354/graco_benton_4-in-1_convertible_crib_hardware.pdfIn PDF document text
    • http://nipekari.pbworks.com/w/file/fetch/144553812/49755885445.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144887232/gta_iv_app_mobi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 4880 bytes
SHA-256: 4183d59eadd3bc0313998893566b0b434c84089704bbc22110d7b4dd62b2a68b
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 10688 bytes
SHA-256: 7f6ba7b168de21432c2445cba4b266969313a24be1c13ccfd6570d3af7ddf34c
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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