Malicious PDF — malware analysis report

Static analysis result for SHA-256 6355a885d8723032…

MALICIOUS

PDF

79.8 KB Created: 2021-03-29 11:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67f8db036d90c7b4de1feb9f37307649 SHA-1: 586b8a2b909be8f02364c75fa385af4eab6a41ee SHA-256: 6355a885d8723032a656ed09e180d194a57b2c045cd4e3ba1636ed9b410f0aa0
186 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 ClamAV and 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=phrases+agreeing+disagreeing+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5feead0934ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_6018d9a701dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_60410bcb1ebf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60366cb0cceb3.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/DihjjdA/2_player_co_op_split_screen_ps4_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489981/normal_5ffcc3ef05958.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/Ehc1Pij/73749301447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5fd76d96cf8ac.pdfIn PDF document text
    • http://xenakasewexibal.sportsontheweb.net/catalogo_generale_bticino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_600264cf48dfb.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/eh9hbjh/teteg.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/sowid.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/jbTQfbV/fefarasosuraxowuxisuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489975/normal_6014c7a19b754.pdfIn PDF document text
    • https://cdn.sqhk.co/zutomina/fjdNFje/new_homes_for_sale_ludowici_ga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_d5953aa44070436daca920aa42fde53d.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_3918cb2faab34a979a4a20114dcbb8c4.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_ef04293cd23e4bb197809df087168577.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_92a9d11827504553a10ce9c7c5f33c4f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 4872 bytes
SHA-256: 464b7d50f6e65759fe8ea79054917841793bf51e1937d5a87d3252fa447acbc1
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 10692 bytes
SHA-256: fb58ba4c9ad77cc007b1c29e553cded762eda514b4b0370cce4890210b0ed00a
font_02_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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