Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45537d6c4666909…

MALICIOUS

PDF

78.7 KB Created: 2021-05-07 06:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e42727face08bacc0d3585e09a0165c9 SHA-1: bb47ee538f7f349a18eed1ea7f3e4d78f983a224 SHA-256: d45537d6c4666909c2c758520b2a99bb156a6da5afc9901c10adf1c76edbf637
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. One of the extracted URLs, https://leonvi.ru/strik?utm_term=yamaha+motif+xf8+manual+espa%25C3%25B1ol, appears to be a lure for potentially malicious content. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection suggest it is designed to redirect users to malicious sites, likely as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=yamaha+motif+xf8+manual+espa%25C3%25B1ol PDF link annotation
    • https://jaxapinaxet.weebly.com/uploads/1/3/1/4/131406361/pugizoruriwavas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_601bf9595f88d.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/3d1f5.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/a4be9e230452a7a.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/gebuxew.pdfIn PDF document text
    • http://tiktokhd.design/difenizigazutofbu25t.pdfIn PDF document text
    • http://alcexpress1.xyz/pexitumupomawutoji05ir2.pdfIn PDF document text
    • http://my-favshope.online/sharepoint_designer_2013_sp1_download_32_bitsaibc.pdfIn PDF document text
    • http://masajsalonunuz.com/133779939335msd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480408/normal_5fff144c1e92b.pdfIn PDF document text
    • http://mavito.online/resident_evil_1_cheat_codesbsrb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_7aacf2076ccf4d61b0a2e6e76756b9cd.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_9f292cbca8b14bc68b3efb469f3237b4.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_6c3752e7bff848fb84dfa7a720e962de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/gepufibe.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_ed3f1620f2034415ba15415417d12f0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/employer_reference_letter_for_landlord_template_uk.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_4d62a3ca07c24e019e5c1f426181787a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/chow_tai_fook_enterprises_ltd_annual_report.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_9ef295075faf4506858cee379102e00d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/year_5_printable_workbooks.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_c1e152f2daae4f73a458c0f1c6c1014a.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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 5480 bytes
SHA-256: 27f5ad3a3df136ab4b4f885151d5251a8b88920cf54fd1501854d04c6987cdc7
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 13548 bytes
SHA-256: 07ad5c87c3c4e92ece06516be6be40d904d86180bd69aff91e7f60a61ac5d8b5