Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d9572b8b729ecb…

MALICIOUS

PDF

78.5 KB Created: 2021-03-02 23:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 35eb45a719d7a1c7af340ad7ca5431e3 SHA-1: 6a5ea01cc176f08d07a2815f931f6fb268029ccc SHA-256: 84d9572b8b729ecbf47363ef7b9fac9353eaba922ca80906b2f47023a80b8fc8
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, with a primary external URI pointing to a suspicious domain associated with a keyword lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://xajibur.ru/wix?keyword=national+service+training+program+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5fdc72d7ec3fd.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/tedejusivive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500904/normal_60017b7c6e803.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/conflict_management_styles_questionnaire.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/rikiri_tigefokun_viwawumik.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/vusudafagerupur-dadakopujogalo.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/60598747527.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/mapafis.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/84673266496.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/is_wolf_of_wall_street_a_true_story.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/55242165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463006/normal_5fd1b761c4caa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/lowapukoza.pdfIn PDF document text
    • http://famigobefil.epizy.com/manualidades_con_foamy_para_dia_de_muertos.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/jasejevezu.pdfIn PDF document text
    • http://fafovinipola.epizy.com/49321730649.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/iran_apps_market_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 5416 bytes
SHA-256: 6049e044c19e011dc64a9c55aa7d7d5b75e876508431b590f2bc08efe25b3cb3
font_01_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 10636 bytes
SHA-256: cf46033fd472c7949f93e9497c674f7390629f15cd8c548f117981b7a53d89ae

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