Malicious PDF — malware analysis report

Static analysis result for SHA-256 e245b5c47853e251…

MALICIOUS

PDF

83.4 KB Created: 2021-03-27 11:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7de2b33b2b141da3af021ac160754974 SHA-1: bd8b3482f0def6ae77d14e7f7769f2ff5aeb5aac SHA-256: e245b5c47853e251ec0e3238805ebfc5b892fa03faac836968508916eddfeacb
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://resalured.ru/strik?utm_term=how+to+count+values+in+a+column+in+excel+vba PDF link annotation
    • https://cdn.sqhk.co/wobimore/ejgjaxI/real_estate_sales_management_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/NIwGZhb/86717109765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_6009dcf0f0415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_601500dc9cbca.pdfIn PDF document text
    • http://fonexewof.mygamesonline.org/segment_addition_postulate_practice.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/which_processor_is_best_in_i5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_6045f45ef3877.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/jagune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_602719a128922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f35d15-fc06-4590-a591-dbc97e1cbfd0/manual_de_carreo_resumen_capitulo_1.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_4d5881b410eb437caf8f89ce411210d5.pdf?index=trueIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_34d5afc9ed464fdd9a0f4ee96e5380e0.pdf?index=trueIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/what_did_the_social_contract_say.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6824032a-aa34-4f45-9110-64069d8e8b44/javapumanan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810a50d3-dba7-46f8-8c2e-2d4f7d0556f1/how_to_pass_the_pmp_exam_on_your_first_try.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/wuketafiwidobewegatedeb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 5168 bytes
SHA-256: 0525296447645336cdea90517f28dfe085b807564d01fcb6d9f16d71c88829d6
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 11556 bytes
SHA-256: 632faef72b69f392440a6b58230d912a081883a1993ac163d6212d4e08e79bfa
font_02_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 16232 bytes
SHA-256: cc032a1d7efe9f52c63bdca4360dad9aff78fb14a47167d9e0089e6cc9416013

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