Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19d2ef5125a0305…

MALICIOUS

PDF

91.1 KB Created: 2021-06-11 04:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b73a1b098e8b23013bae0b6ee962b27f SHA-1: 12444f0b4f758f0bf6e5225e3a577322aa194931 SHA-256: f19d2ef5125a03050047ebcb2e2b6fb3c6dd4b8325cdb40375531242071776ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, with the 'Pdf.Phishing.Trojan' signature pointing towards phishing or trojanized content. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/pbw?utm_term=how+to+do+slime+without+borax PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370764/normal_606207dce20ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_60c2476658d52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_600f205956249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fe80d5e2830e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_60be0b9131cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_5fe8c8a5b5631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_6016ac6227d70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_6002bca4a76dd.pdfIn PDF document text
    • https://desijikero.weebly.com/uploads/1/3/5/9/135964668/zuturasaposu-kunupej-xasesetusara-dajadivoleripup.pdfIn PDF document text
    • https://jomopejizudo.weebly.com/uploads/1/3/4/6/134664487/vibijagekejakis-kimigowizaset-zavafumotim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_6054c913c293c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_60b9a5ef92e52.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4496577/normal_60b3ef1d5f36a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_605c93d0eeca3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5feb3a9d5adbe.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/cf677c59-214f-4423-8b00-51b1d24f04eb/the_raven_cycle_box_set_hardcover.pdfIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144807558/accounting_2_chapter_3_homework_answers_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb035e2e-2c76-41e8-aa68-4f29b278d713/feelings_and_emotions_lesson_plans_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35186c4e-c2dc-4761-a66c-cc674704e6bb/windows_8_pro_product_key_free_download.pdfIn PDF document text
    • http://tujedet.pbworks.com/w/file/fetch/144627765/46698544445.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144471882/bullet_force_unity_webgl_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50f03c3-d2d6-46a4-ae51-78591e2d3235/damuxijexufasakipuzop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afad05e-e94c-4657-b347-54e2a81e8510/zoredusajitamuzufipapon.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 5104 bytes
SHA-256: 0e62c8e1999f9f7e806af2eb46ee303cceda58d19b13a075b18def796a773c34
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 11160 bytes
SHA-256: ee755b77800693949ac7a6366f4e00897275c9cf46c9a772bb1f057b7c1c72e4
font_02_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
font_03_sfnt_off00014ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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