Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9470a110f207d5…

MALICIOUS

PDF

78.3 KB Created: 2021-04-11 07:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c901e04d8b7c04972995523eb8c876ca SHA-1: b32b7ca80aa52d831bdb7306f8c701da1554f8d5 SHA-256: 2e9470a110f207d59cc7cfb8bd843ed3fe08367a9c3254ce48cd7df79e4f4934
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 0.9998

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://soxebez.ru/strik?utm_term=beats+solo+review+reddit PDF link annotation
    • https://cdn.sqhk.co/sawusuzi/xyhj0Fe/zokuzojodamumitowiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/b2YkgPm/dragons_legend_merge_and_build_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xegogeji/SjdjflD/5718858344.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/f2nTvkd/forward_bank_stanley_wi.pdfIn PDF document text
    • http://rivokalodusi.sportsontheweb.net/10910756206.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/cUgjMFJ/jocelyn_flores_piano_sheet_music_with_letters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_e37ecd066a1744fbb2f26c10df086f9b.pdf?index=trueIn PDF document text
    • http://wuragumok.atwebpages.com/universal_logic_gates.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_ea3a66dfc1da4c46a48e4c40e6ee5fba.pdf?index=trueIn PDF document text
    • http://bitujiduruv.myartsonline.com/gutiseduruzuva.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_8500c0d86c9f4678b071913595170a25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/livogiwumipasa.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/nelevizerepavigovono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a0280c-e9bd-4f04-81a2-4d6d33578c5b/which_diet_is_best_after_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/ideal_gas_law_worksheet_carson_dellosa.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/wiwumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38659f36-374a-47db-b3ee-caef4f36ad2a/13283583673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959b6520-f34e-4d47-a9ca-91b2784b9f16/kaferesuximogo.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_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 5020 bytes
SHA-256: ca06a7905a2a91ed5f28970e92db17e4ca6c54b71e575da4b48c5ae7162e7fea
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 11152 bytes
SHA-256: 91fef62fd10020bb8868ab4e10172b1029d1bdffb7811ec5848f4e3a68350e7d

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