Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83bdb45657568ef…

MALICIOUS

PDF

47.5 KB Created: 2020-11-09 08:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3e7f4f9324546d611ae306dc4966c1e5 SHA-1: e5188f66b6e2bad53074481ff7e403ad3b356aec SHA-256: c83bdb45657568ef19c615ff32da9e12617f5e4dcfe8fc4dfc1d378929562a30
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://trafficel.ru/123?keyword=cool+math+games+unblocked+games+google+sites PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5f9d7e9181a8e.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/fitilila-virajem.pdfIn PDF document text
    • https://wolegowagu.weebly.com/uploads/1/3/4/4/134404953/beb1a.pdfIn PDF document text
    • https://lutenidu.weebly.com/uploads/1/3/4/3/134398581/4c89626b1b8.pdfIn PDF document text
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/3671728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5f990aab205bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f87388d3cdbf.pdfIn PDF document text
    • https://fudixiboronis.weebly.com/uploads/1/3/4/3/134322082/8687344.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/vaterozelufikupus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9d2ec21f-e89a-42fa-9e2b-497cdadcc470/wubiriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773f0ff6-aa4f-4d79-8e6d-70edd7e3c34c/tuvawiposaputizozodixeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44deada-42ff-46f6-8d5c-b77f1aa921cb/ataxia_in_dogs_causes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e3abfc-38d7-4060-b2fd-e31492b4de8d/sejevewe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD0 5364 bytes
SHA-256: b413aa79bb7ea61a510ba3ce745bdb058aae499dca1d25188f99e886bacd3f6b
font_01_sfnt_off00007cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEA 11012 bytes
SHA-256: 86d9997c76cd3d3f99dd9934d4660312f83190aea4cbd720b97f1cae4f726076
font_02_sfnt_off0000a267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA267 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.