Malicious PDF — malware analysis report

Static analysis result for SHA-256 37995399b7d3a6df…

MALICIOUS

PDF

33.0 KB Created: 2020-11-06 21:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c4096a98b0bc43f54af7b509776f0a5 SHA-1: 9083bb619e96138e161f5c18ccd2e00c8b6ba066 SHA-256: 37995399b7d3a6df9cee4d59fe3231af4af0b02df3a30162e9c897501471fdc3
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://traffking.ru/aws?keyword=hannaford+forest+avenue+portland+maine PDF link annotation
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/6949257.pdfIn PDF document text
    • https://ravusosu.weebly.com/uploads/1/3/4/5/134589623/zuvikalazufegu.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/6055623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5f94df7f7211f.pdfIn PDF document text
    • https://xegoguvaposa.weebly.com/uploads/1/3/4/6/134677344/5831765.pdfIn PDF document text
    • https://www.hannafIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/amoxicilina_suspensao_bula.pdfIn PDF document text
    • https://xewuripew660320655.files.wordpress.com/2020/11/fovagasadalimedav.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/85257647312.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/rutevu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4279 5208 bytes
SHA-256: 04dce10c04eebbca7ec1b3372c77ba3e05e4d57a8425c8966baffe603291549f
font_01_sfnt_off0000541f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x541F 10176 bytes
SHA-256: 6202f463febdd3e9be5fc3175b06f265bb61d5aeb90d255a679a53b86730648b

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