Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6c41e55e9b941b…

MALICIOUS

PDF

41.5 KB Created: 2020-11-06 14:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9250be9e026094a3608bd1da0b29c89f SHA-1: d361b6f2f58d7fc28ecc29b63006cf718b972cfd SHA-256: 1b6c41e55e9b941bffcf014d5c16ef382319af61ef9acc28bde6b32488fb5e55
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=crash+course+math PDF link annotation
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/4603723.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/5973265.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/5a7b27b1400268f.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/jajexuduberaxum.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/9b53ec72f.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/disibazugetifediriwe.pdfIn PDF document text
    • https://tinavabubopani.weebly.com/uploads/1/3/4/3/134317914/240155.pdfIn PDF document text
    • https://penepanixefi.weebly.com/uploads/1/3/4/3/134354239/rapasirudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fa433d36caed.pdfIn PDF document text
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/f0a357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3467/5864/files/villains_movie_trailer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/assets_folder_location_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6eb62d6-acb0-4d47-a7c7-baec9345fb54/jubexogubunawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d4ce26-62bf-4205-8aff-700d7c96885e/316293224.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/49728174883.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/mapa_almeria_capital.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_off000064a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A7 4912 bytes
SHA-256: f05a731c38643dde8e928b835171c47c7a661d30c8e1e57bd15c4028286ac681
font_01_sfnt_off00007526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7526 10548 bytes
SHA-256: 0f6936ae6b50010e49479a72f2e9d6e3c1b431c4b545413bfbf0e559efbe4c33

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