Malicious PDF — malware analysis report

Static analysis result for SHA-256 31170804cdb1d672…

MALICIOUS

PDF

72.8 KB Created: 2021-03-10 07:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d555dd6b26a13beb92d9c1743495178 SHA-1: 5aecf4bb2b91a5626cf0269819456ab5c14776bb SHA-256: 31170804cdb1d672ac752bc57d907f46d11f429d8cc4fddf5f287777d0898c9b
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://kuzutuzo.ru/123?utm_term=periodic+table+worksheet+1-+60 PDF link annotation
    • https://cdn.sqhk.co/xejexeremiso/hhgieie/mod_for_among_us_imposter_hack_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/higjbji/french_manicure_acrylic_nails_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/M4ieOjh/degimulasetop.pdfIn PDF document text
    • https://pidodogifir.weebly.com/uploads/1/3/1/3/131383649/bd6fde9a5bf3a2c.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/jjneDjt/super_rangers_cars_power_race_3ds.pdfIn PDF document text
    • https://wowavimisaken.weebly.com/uploads/1/3/0/8/130814021/xusaxugojadapupudutu.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/v3jcPhi/fsl_topup_eddy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_342a9cfdce564c6380ca6ba63837fecf.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_dbe73cf533ec4d27976de776e028f390.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_ffe702ab18eb4a1ebd6da22ab75105f2.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_b54c3d25d5ba411dab9f96613e73a0ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc44ba01-d4c4-4050-b59d-4e3e53ece93a/anaconda_jupyter_notebook_-_change_working_directory_windows.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_8cead3adf12846b19736f8e178bc429f.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_8f2a01c7a4f3415aa6aaff97b820fe78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78983f98-2796-4ae6-a6af-5f0216532f99/what_is_the_purpose_of_rh_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7988dc-8c01-4596-b672-6a2578a0ee1b/odd_character_sheet.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 5704 bytes
SHA-256: 3a7d023c431825c8a813e12fdbf9688e5d6dfd763b1bf461c147568c9fc106cd
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 10220 bytes
SHA-256: b2fdab59e73085f03256179fce5fd231081672d3cc249d3f56ec59a86bb63bab

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