Malicious PDF — malware analysis report

Static analysis result for SHA-256 d461ebd2349c8864…

MALICIOUS

PDF

78.8 KB Created: 2021-03-05 10:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 014f6be5df813a072579d4b51202bd3b SHA-1: eadf733f719255c70840c3f9395890cc4b98dfd2 SHA-256: d461ebd2349c886402376fcf6f2afa9f7a6fcf98f2a2cc97ae96cd71aa35bba9
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains XFA form elements and multiple external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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=how+to+turn+off+flash+on+polaroid+sun+600 PDF link annotation
    • http://mepuner.iblogger.org/fomeno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421613/normal_6000eaf7c48b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_6039c00bc0a8d.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/libro_cien_aos_de_soledad_de_que_trata.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/hjibbhf/kriss_vector_22lr_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/jZjihcf/83412009584.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/calories_in_fresco_style_taco_bell.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/61080131905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_602ce41d6f341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_600583220b94e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421939/normal_5fced9372c47a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366032/normal_5fe06d53b2fa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fcdbb07d6acb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitesegu.epizy.com/4517574884.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_0060496d19364d14b6ea0317f261a8d4.pdf?index=trueIn PDF document text
    • http://mibobugaf.rf.gd/feranumax.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_da0fdb4f32174778be9e816967862d04.pdf?index=trueIn PDF document text
    • http://tefabawamibane.epizy.com/4024248371.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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 5476 bytes
SHA-256: e3b3bda504dd6b4fe442a07daf471a1aefe48e76e1b40e10ebde2171d928eec0
font_01_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 11036 bytes
SHA-256: 7ebed4c41e9e1a94ed1fef06d215836fc0db531fee3024e677444a4c1a1895b0

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