Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1a3728e88bd6d9…

MALICIOUS

PDF

85.2 KB Created: 2020-11-09 09:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5a7fda094cf631ff7c3b1eeb1a1ece85 SHA-1: 5c32e9c397acc7aca356b16af3f68603f6336dda SHA-256: 3b1a3728e88bd6d96f34c0b591cb4b3b70b72139e9bc501095885d91e4da1f3d
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/123?keyword=roswell+new+mexico+tv+show+episode+guide PDF link annotation
    • https://xotukejurivaj.weebly.com/uploads/1/3/4/0/134016857/wozid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_5fa4364e44695.pdfIn PDF document text
    • https://jawiniralegewo.weebly.com/uploads/1/3/4/4/134492986/0ccb4f1a6a74.pdfIn PDF document text
    • https://lugapageragije.weebly.com/uploads/1/3/4/6/134617753/jutigaxadixir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f914c1cb0508.pdfIn PDF document text
    • https://sajorezofadem.weebly.com/uploads/1/3/3/9/133999754/9889156.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://juzikarew.files.wordpress.com/2020/11/64641752565.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37f0975-c866-405d-8a31-28c437dbe16f/zasetu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/40525934833.pdfIn PDF document text
    • https://zisaniv.files.wordpress.com/2020/11/38506493434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46b0b53-88b8-4454-9c1c-59c8a14be06e/xewidetakapanuzusovawike.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://mereluk.files.wordpress.com/2020/11/73139632206.pdfIn PDF document text
    • https://redanit.files.wordpress.com/2020/11/94764266058.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/77675822927.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 5292 bytes
SHA-256: 311a61d6135dc38d3c82666ee5f78bb1f9dde6bd5e2113eba3151cc5d7606b4b
font_01_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 11928 bytes
SHA-256: ca19f2296fd7231f7e92a3fc43fabbc936a7e1440404ad233a28945d5ca18144
font_02_sfnt_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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