Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a58e94575bca43…

MALICIOUS

PDF

125.4 KB Created: 2021-06-09 03:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f25f80f106cabfb4d0540d81c6c1078a SHA-1: 85257485d4852e73b92aceca2ea29a9b9d185927 SHA-256: d5a58e94575bca4349c8533838e203ccd2bde1b25ac4ffe63588d0cfe4f12bef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL distribution strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 5

  • 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 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://huntic.ru/pbw?utm_term=human+embryology+yogesh+sontakke+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447436/normal_6069c2324af46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fc7b74833e34.pdfIn PDF document text
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/9d0c7c16ef.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4425515/normal_60b3238d19c92.pdfIn PDF document text
    • https://bunexomuxupekir.weebly.com/uploads/1/3/5/3/135316193/c194f245ef.pdfIn PDF document text
    • https://noruvejepemapab.weebly.com/uploads/1/3/4/7/134702548/sixotenasix-negogojepur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_6058bd4b22745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_606ae7f08422a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389107/normal_60b32478708ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_605b979dc3d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fdc6fc975fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490724/normal_6005ba69836e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_602ad01e7f3dc.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/1f8f117c-25ed-447c-b0a0-2a6390a9afec/microsoft_office_professional_plus_2013_activation_key_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79af22b5-2157-49f9-bd33-52f48988ecff/graco_magnum_xr7_vs_x7.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144803799/xusemuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3083cb-f3cc-4097-9806-c20c39ce38be/bioflix_protein_synthesis_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcf2805-93fb-461e-a52f-10e697b679c4/52024200440.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/88842228078.pdfIn PDF document text
    • http://kiwuwas.pbworks.com/w/file/fetch/144684528/romunopof.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/type_a_blood_food_list.pdfIn PDF document text
    • http://vuxoris.pbworks.com/w/file/fetch/144606936/menitinipesosudemu.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/w/file/fetch/144571695/queen_size_bed_ikea_india.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144752970/paturigovi.pdfIn PDF document text
    • http://lekadebixe.pbworks.com/f/quantitative_aptitude_practice_questions_for_bank_exams.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144666753/chord_analyser_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A38 5720 bytes
SHA-256: 4d5e00049b8291cbff948c5b1ab72e413fa4160e53ff93a082e3539e376e11b2
font_01_sfnt_off00019d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D7C 15768 bytes
SHA-256: 7727cb097ca531aaba2c1f09e29f213748df1bf028d5651e2ff3f30fff9f53d6
font_02_sfnt_off0001d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D097 16348 bytes
SHA-256: 3e355fe50c9cc15de6876da4f6ba1995a0c9ebdc80be86e485bb31eae78c2d9d

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