Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d9baf91dbfc785…

MALICIOUS

PDF

82.5 KB Created: 2021-05-30 05:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f9908a433a7a4de0e4f23349bf39d269 SHA-1: c6cbca14e566cf55c409a63cb0c0a92870ba8f7e SHA-256: f9d9baf91dbfc785566da9fa863c3465816f010980117244559c0150d07f68a1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=12+steps+of+surya+namaskar+benefits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fe987a87b95f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_601bd1d8bb2eb.pdfIn PDF document text
    • https://rifatusozoked.weebly.com/uploads/1/3/2/6/132681337/siluxalod.pdfIn PDF document text
    • https://wodokapiv.weebly.com/uploads/1/3/4/5/134584818/cf8621.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/4e1277a56ff191.pdfIn PDF document text
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/1fe52c.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/7495242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fff12ce9f3f4.pdfIn PDF document text
    • https://panodetis.weebly.com/uploads/1/3/4/6/134669877/e564eca0.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/e84aab76718fe.pdfIn PDF document text
    • https://bopifodefow.weebly.com/uploads/1/3/4/3/134383970/64cd79a6a052e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab0faeb-a232-4dd1-961c-a29cb780a1c6/51153006464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7129f4e1-d4a1-4e70-8ffe-08611dede09b/lojopefinutaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc8b26c-fab6-4929-add4-04256b901fc7/lezexetemiwileboti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db57c5f5-4e79-4a5e-92a1-4b9ea2a1388e/legrand_rex_2000_d21w_vdeos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fff61ef-8f67-4069-87ad-d64cb7b83a1e/how_to_do_a_fake_pregnancy_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3154d190-a916-4096-aa23-29cca9043718/72_nombres_de_dios_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9585366f-5e96-4c44-835d-bfb30cf5de5f/rusesatiguminifegika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a500ca7d-072b-4d6e-9849-6830756f3356/how_to_write_a_resignation_letter_leaving_for_personal_reasons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27f7244-590b-45ae-9c6d-9e52d23686e8/how_much_is_acura_b12_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c717e1a9-feee-4344-a119-9679a3fd82aa/vugigusuxozosinupanulobef.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 5412 bytes
SHA-256: 72fbea260bcc2d321ae275f2beea34e79e72e4c89ec379e436052298eedfe3dc
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10492 bytes
SHA-256: f1ae8bec7a5d5f0fdc627d5a613fa9d1804d65f9a54918e42d5a8dadc4c22a8e
font_03_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 6248 bytes
SHA-256: 46e3a27daf597d65e69aed72b22503d47c07ce708a119453215e625683765aad

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