Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dc30fa0ce94516…

MALICIOUS

PDF

37.4 KB Created: 2020-11-08 14:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 22d28db002f2e19de3747a87eabeaef4 SHA-1: de22891cb86fe1f5293ee67a9cb0c68e4656a9b5 SHA-256: 86dc30fa0ce94516846699698e1c94553eafc6b99d6f371f67542d8d381fa5b7
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://traffnew.ru/aws?keyword=cool+math+games+run+3+debugger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403129/normal_5f9b77251a712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5f948ba0ea21b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f8ead54d873c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5fa20fff43a34.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/f18e11675cd7c47.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/1390789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5f9a806ba58f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5f9ad7a34a1b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nudekix.files.wordpress.com/2020/11/lee_morgan_take_twelve.pdfIn PDF document text
    • https://mogogupiwilu.files.wordpress.com/2020/11/vorevawezakewaxakag.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://demoxugu.files.wordpress.com/2020/11/apprendre_portugais_prononciation.pdfIn PDF document text
    • https://pokagiriti.files.wordpress.com/2020/11/dosanebo.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_off0000522e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x522E 5448 bytes
SHA-256: 9f367f842c98bdc07f4e657b6a237acd8856c004e2ab8197a09b77529ae82766
font_01_sfnt_off0000647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 10772 bytes
SHA-256: 2082d3a362903ea0fc95782a962a9ce377f794d374d5ab5e2d8be776233dbf46

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