Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ec9c758f95ce47…

MALICIOUS

PDF

50.6 KB Created: 2020-11-07 23:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6471dd803db0006b484d769eb3e22853 SHA-1: d9c35e176e70d13f64ef451f2e8a81b90e985d0b SHA-256: 48ec9c758f95ce47a07323b47feab441dee60b0997f7cf9525365cc1400afa13
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://traffset.ru/aws?keyword=hanceville+high+school+al PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f89b72c25b3f.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/gegetajuzixu_saralajewazamok_livaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5f97a9873c65e.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/jetewobonizo.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/55f112be-d70c-4fc4-ba71-6ef080f54c1d/62161144802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd851c12-8e32-4af5-b0c9-d3317a2f6e8f/key_to_ravenhearst_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/69948523090.pdfIn PDF document text
    • https://badelafe.files.wordpress.com/2020/11/ensaios_sobre_o_conceito_de_cultura.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/apache_hadoop_ecosystem.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/cato_hunger_games_traits.pdfIn PDF document text
    • https://wazewezobe.files.wordpress.com/2020/11/kavuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0447ea-7f05-45f7-bf9e-da6aa7e7794f/8352001154.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_off00008777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8777 4984 bytes
SHA-256: 1ec0042f0240a874715a9733e37d90f3697fdd9d9a50482092fc71c75252b69f
font_01_sfnt_off00009871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9871 10872 bytes
SHA-256: 2de6419cd8f1fc02ed754cbb14d2ec73f7c5ed13a0fbfa8bdf39b23494f69cae

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