Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad98b96d3c4464b…

MALICIOUS

PDF

78.5 KB Created: 2021-04-18 08:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 981a6889c90938f28b4d9bbc95bb8673 SHA-1: de393e1ce419a804cbf4feea070c59538d4f34fe SHA-256: aad98b96d3c4464be7914d568fccaecca0720e6667bbfdf206b2a8540685f3b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://pelibifir.ru/strik?utm_term=download+microsoft+excel+2013+for+mac+free+full+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fe10956c9570.pdfIn PDF document text
    • http://batmbatm.ru/76906016524fgslt.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/50b92822357fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_604da61c18a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_602eec99e99ae.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/hddjecS/razadefeda.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/basisulabinaralonan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_606bbc5cb1d13.pdfIn PDF document text
    • http://proita.space/97454820234ckqdx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_60262b461324f.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/jbziexK/fefegekubuke.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/eEhdgiM/free_online_spanish_to_english_translation_websites.pdfIn PDF document text
    • https://cdn.sqhk.co/zefadanexa/bhcgeig/types_of_interview_questions_and_their_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_1ac6e72c1cd943db9c95be99956b3310.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_f24de865a803434280bd5e6663a874f9.pdf?index=trueIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_dfa589167ae14b588fddbaf53a8c1ed2.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_a68f23287ce140b9a439c37673052615.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_83eceeb6787a45bab87f71e6d2ef9fc6.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_c25b9b1322e741fd91b7ac71886b57dd.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_3c8e5fcff57f4583a819482052237840.pdf?index=trueIn PDF document text
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_5863bf9435484cf99a8881f2454057c9.pdf?index=trueIn 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 5876 bytes
SHA-256: 3a5eb3ee1e950068272cabd6b191c4d0734610628de80c66c683932080a95931
font_01_sfnt_off000109bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 10128 bytes
SHA-256: c6596c88e2286eb44473248a837b9d6c76b515e9cce8577d2bdc0d0d594564f2

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