Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d955f19bb895a85…

MALICIOUS

PDF

78.2 KB Created: 2021-04-29 11:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7e82ea349ead81ca072a2811741bfc63 SHA-1: 76b36739a1e6b355e8cc818f6b5375a3cd0bcb1f SHA-256: 7d955f19bb895a8528f85ecbe8db0003849403971cde6e46eb742643e58b2d28
166 Risk Score

Malware Insights

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

The file is a PDF containing multiple external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt an archive, a common tactic to bypass gateway scanning. While no scripts were explicitly extracted, the presence of PDF_URI and ML_NYX_PDF_MALICIOUS firings, along with ClamAV detection, strongly suggests malicious intent, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/strik?utm_term=yamaha+01v96+usb+midi+driver PDF link annotation
    • http://digitaltoolsfor.xyz/what_helps_menstrual_cramps_naturallyipqtd.pdfIn PDF document text
    • http://originalhallyu.com/d-link_dir-615_admin_username_passwordqepnd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_606978d626e35.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/piderebuzozipi.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/xulorabuf.pdfIn PDF document text
    • https://zozutogumudeke.weebly.com/uploads/1/3/4/4/134440166/tevefekiwixur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_602a4ffe09ef8.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/mewuvabunedoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393883/normal_600134e9295f0.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/lekodapafopokoxug.pdfIn PDF document text
    • http://instapresent.site/building_services_includepwg9y.pdfIn PDF document text
    • http://hookup756.fun/shark_vacuum_ownerxmjis.pdfIn PDF document text
    • http://dmdmassage.com/lic_policy_cancellation_letter_format6rtqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_603bf93677fbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5ff88f0015a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_602e5432f263f.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/72c15522-3b49-42b0-a93d-5cb309887484/sezipigijama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8509715d-8473-4c7f-bfef-5bfa70f13907/imagen_de_caritas_felices_animadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ec7b3c-74ec-40a1-8522-96414114f55b/xukari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313c1efc-2301-4e56-a067-cc7febfadede/how_taxes_affect_gdp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47db1067-eeb1-4871-8f01-d46489e3857c/80586131745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf8797b-0168-499f-9197-59f7af7cda3c/famous_quotes_about_air_power.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_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 5700 bytes
SHA-256: b871c298cb3c8fd59bbbbb632dd9f738140988f37f885c64509d314a57e2e7f5
font_01_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 10780 bytes
SHA-256: e0c94317989032d2f3e7095058383f42012cc9f5c7ecf81d0772708393883283