Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaf0bae6a905360…

MALICIOUS

PDF

41.0 KB Created: 2020-11-07 23:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4b62587f3c56528c532daa65b4217aec SHA-1: 23a740e73f38efe4e4e9dfcf02070eed2baf30ad SHA-256: 6eaf0bae6a9053608d9ab36a74c24e0077d1d22707f67ed6061b9d03e8715883
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 4

  • 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://traffset.ru/aws?keyword=ashtabula+county+auditor+conveyance+forms PDF link annotation
    • https://fuwurugosudopo.weebly.com/uploads/1/3/4/3/134326966/eadf86d1c.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/tupenikiva.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/sorup.pdfIn PDF document text
    • https://relupopakamon.weebly.com/uploads/1/3/4/4/134455445/f2d5f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f9c0988df53e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8cc5461169f.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/tuzapixixif-mugedipawutiw-kusirepel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fifuto/72032030766.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bonekefodilareniximadipe.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/41740047687.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/5487817994.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/words_beginning_with_p_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/what_is_a_affiant_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f5bd1d-3163-4802-824a-3472c23f4c7e/subaru_forester_maintenance_schedule_2015.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_off000060dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DC 5552 bytes
SHA-256: 5b371fbd68e7296c60a9fc00366d6db5c0554f19249b0b9e95459332bd185519
font_01_sfnt_off000073a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 10448 bytes
SHA-256: dd33873499eeb960a5e547fce341ce9011cb60b720aa0b1efedf631c545969c7

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