Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fbecdb850eeab2…

MALICIOUS

PDF

86.4 KB Created: 2021-05-10 19:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9db0ade6bacec59ed98aee1b896349d4 SHA-1: ebe6092d1dd71ea368ee5252b130c6ee59f27940 SHA-256: 33fbecdb850eeab2b745e685af7d5bb533b8b98ae6e3d8c516d0fee5c27c7456
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 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 5

  • 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 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=what+music+does+honduras+listen+to PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408976/normal_6057b81f2b226.pdfIn PDF document text
    • http://static-start.top/mallorca_albeniz_guitarewkh9.pdfIn PDF document text
    • http://kulinar2020.site/aia_group_annual_report_2008o7vso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_60476d46eb927.pdfIn PDF document text
    • http://idealica-co.site/53779305770t4ukx.pdfIn PDF document text
    • http://baby-slings.ru/zipojanudum50uoy.pdfIn PDF document text
    • http://detonic-buy.website/summoners_war_lost_centuria5omyh.pdfIn PDF document text
    • http://webpost.pro/dobudejasob070qc.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/winerezijudibz39cq.pdfIn PDF document text
    • http://znasila.ru/403972528691auq2.pdfIn PDF document text
    • http://esportzmlevent.com/zowoguwi4ym.pdfIn PDF document text
    • http://sait-ok.ru/how_to_clean_stairs_with_bissell_proheatmikg2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_1dd46b04954d4a08b835cc2ad3dc0f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14b591a-f8d7-44a9-a81d-4b5b7b82ea8e/nzxt_guardian_921_specs.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/mahindra_tractor_price_list.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_b71b37d281ad480ebb5ad583122b2dbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcdc87e-f356-4774-96fa-14b3d7637a44/xipaxipamomozevaguxow.pdfIn PDF document text
    • https://3228dc58-b2c1-4aed-ac20-03fc52793822.filesusr.com/ugd/43afbb_cc9b59e7fdcb4bf3a4dc565e10896531.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_b64a678ad36c4c15a8bcc4e87a458209.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 5192 bytes
SHA-256: 3580317d2ad8b9d0f1adf0e765569db222a12769378a8636e99ed9a96f09774b
font_01_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 11720 bytes
SHA-256: ab9f821408ce34262d0bf35ec853306d1b104c5a11226b028a668c0649203e40

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