Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b874b02d8f6cfc6…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 05:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 74707863c3d0ea07bfbe0f465d72be57 SHA-1: 8eed24ad444add5626eb93b3d7a8f96d1b73d6db SHA-256: 3b874b02d8f6cfc66cebf1447f6d7d61aefca9592c5e3ebed07bed9f2e9b70fb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/award?keyword=los+organelos+celulares+pdf PDF link annotation
    • https://xaxepilote.weebly.com/uploads/1/3/4/2/134265473/2f770.pdfIn PDF document text
    • http://itslm.fun/footloose_piano_sheet_musictbp3u.pdfIn PDF document text
    • http://pinipuvazus.22web.org/bancos_de_capacitores_schneider.pdfIn PDF document text
    • http://naturaleone.space/how_to_write_a_script_for_a_movie_in_malayalamnc8rs.pdfIn PDF document text
    • http://mishabelle.ru/78016114958nf1c3.pdfIn PDF document text
    • http://nextauto02.ru/sony_bdp-bx59_no_soundv1nrx.pdfIn PDF document text
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/xutikivobara.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/kinifidatarar.pdfIn PDF document text
    • http://xojitufos.66ghz.com/tabela_de_preos_de_carros_novos.pdfIn PDF document text
    • http://spencermcman.us/derutojedaunanm.pdfIn PDF document text
    • http://flowerport.market/mumurizomesnbx5o.pdfIn PDF document text
    • http://numberoone.xyz/traditional_african_drum_beat_mp3_download9b0cn.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/f8f7a1a3-0264-4d73-bbe4-1ff5232317f9/air_force_portal_login_mac.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_d40fdcb42fe54862af6e6048c8726ea3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff17c92-e258-4fb5-a017-37315eec2f7a/48362463940.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_963d17204bbb4380ac05f3bdc8764431.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_e4659a56aca54f6d819862e6b34663d9.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_4a488eba940d4b9a9df2277b5c8165a3.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_b547de2e3e014458b6d891a64859c560.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88070170-6e26-42e7-b0ef-6c7145d86352/tetokipiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a80f39-5235-4fda-bbad-a47c1544646b/82185809406.pdfIn PDF document text
    • http://bunopudo.rf.gd/windows_7_iso_without_product_key.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_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 5020 bytes
SHA-256: da13c840d800c047514cb4cc064049fe6c72289b4d37428fdb7d00a040a97053
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 12080 bytes
SHA-256: c6f64672570aa6a5ee4ce36a9ed4b6781325e7c1a66d23840dd4295b5c2df14e
font_02_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2