Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b267cc29f966ce…

MALICIOUS

PDF

43.3 KB Created: 2020-11-09 00:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cd0872eb305da77db0305ae30277a556 SHA-1: dd2c57f87976c8e2ad1bd5262829205c5d25397e SHA-256: 92b267cc29f966ced4fa78f22bceb1ba53bd45dbb173049fc0050a3ede07f1b2
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://trafftec.ru/123?keyword=best+chess+games+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389616/normal_5f9e66014f64c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://totarex.files.wordpress.com/2020/11/nuzelubomezeresuzo.pdfIn PDF document text
    • https://nonoxogudege.files.wordpress.com/2020/11/77223613237.pdfIn PDF document text
    • https://tibepitetuj.files.wordpress.com/2020/11/jetunobove.pdfIn PDF document text
    • https://pedaxuk.files.wordpress.com/2020/11/vobedum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4fb8039-eaad-46c7-be58-1a8f03b59837/92783927513.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://nagerare.files.wordpress.com/2020/11/38945102732.pdfIn PDF document text
    • https://xixojis.files.wordpress.com/2020/11/73931432077.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/eos_rebel_g_manual.pdfIn PDF document text
    • https://tabubiselo.files.wordpress.com/2020/11/broiler_chicken_weight_chart.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_off000068ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5408 bytes
SHA-256: 311442f8654995192b77f3b90e2f725cfa1b4a0c8012dc1f9e6212ed68ed93a8
font_01_sfnt_off00007b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3D 11216 bytes
SHA-256: 6e16964f91bd90f6a474185e8769b9a28058a8bef9ae19cc371954928eeb89b2

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