Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a45d1f06e2945e…

MALICIOUS

PDF

57.1 KB Created: 2020-11-07 19:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0cb809f6101bf6cbf46cc6d5b8a40a90 SHA-1: 5b5a6a1a322cf657a9fdf81dbe32d81ca8f2872e SHA-256: f3a45d1f06e2945ef6f36e9457a5f4474eb16241f83ba561771a3dddf77a0c3b
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 1.0000

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://trafffe.ru/123?keyword=earth+science+pearson+workbook+answers PDF link annotation
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/3259101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5f908fe08cf24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f8731c479166.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/muxujagojaxipasulugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f9427b5775c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gadelonu.files.wordpress.com/2020/11/solaxidelowusexuk.pdfIn PDF document text
    • https://dogusavub.files.wordpress.com/2020/11/51165580929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf41fc3-690d-42e5-ab2f-db74ec192f08/16954070176.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://ripigewub.files.wordpress.com/2020/11/sevakupiwejukoduzolaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a764ce1c-ee8e-4349-8667-f4c3c489a7a9/30067643829.pdfIn PDF document text
    • https://bixirofu.files.wordpress.com/2020/11/gosulobagule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71de0ae4-d19f-404b-8b1f-837f999b3e11/singapore_math_4th_grade_workbook_pd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21ad4d8-1cc0-43e8-8dfb-f5a501e837fb/bekujiredufos.pdfIn PDF document text
    • https://selogum.files.wordpress.com/2020/11/demufegezi.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_off00009fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB5 5240 bytes
SHA-256: 73d3bd0bc16017dece87689cd8cb52fce3ee3281598277ef6e60ca60423c7977
font_01_sfnt_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 11384 bytes
SHA-256: 552ee95f90f472f48068568c2ea331b2a757fada1be98fd748122c140f8f0de8

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