Malicious PDF — malware analysis report

Static analysis result for SHA-256 e496c560da2d290a…

MALICIOUS

PDF

76.9 KB Created: 2020-11-09 20:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 813ed34e415cbeebf99af921944a3824 SHA-1: d9913638e1d995cc48924ac65d296ec5c7ae6578 SHA-256: e496c560da2d290a247dd288778f313f2a1c51748df30a83d0f53ae5313be734
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 0.9998

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=best+hd+boy+skins+minecraft PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/9188560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5f9691bf43352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5f92c2dd37903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8936d96bb2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_5f90f4b6d2e39.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/17c1f8953c4.pdfIn PDF document text
    • https://kekofazejigax.weebly.com/uploads/1/3/4/6/134600595/1760955.pdfIn PDF document text
    • https://domenotupeloli.weebly.com/uploads/1/3/4/6/134685365/wisawanudivawud_zebimetixefa_lumujujaje_ganakaropoxurop.pdfIn PDF document text
    • https://mekadademuru.weebly.com/uploads/1/3/4/3/134367219/f0ee51.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/0e97fe8c-04eb-4ca6-b0e5-df90907455de/56229515384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83dfa6f2-56e2-4db8-9069-a7ef94a4a884/ganisazopufazolamu.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/pimezibujepimizes.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/28507134727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9a5ef5-1907-415a-9328-4299f03c4a55/71640107775.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 5584 bytes
SHA-256: 2de57bec90edf49b19df7eb1dfc793af682a5ad2a21de1fc1e7df5fad4570da8
font_01_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 9772 bytes
SHA-256: 32b83521a3c8f0dc08adde3a7cbd46e8badbf27b4dc543b462fc13dc45e96bd0
font_02_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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