Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4d9c64e9e20cd0…

MALICIOUS

PDF

95.5 KB Created: 2021-03-14 12:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4093f28584b1348ce3dbeb4068b3fe80 SHA-1: 96d2ddf804cc6327fc25daf38e53d1bf30352b4b SHA-256: 4a4d9c64e9e20cd062b6ccd1c2e55f7dc07457dce93312f3ddb20b4687769f82
186 Risk Score

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 0.9996

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
  • 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://pelibifir.ru/wix?keyword=the+wait+book+devon+franklin+pdf PDF link annotation
    • http://questotzvezd.space/15367760505sdbip.pdfIn PDF document text
    • http://praktika-ingenieur.com/52966617150hx3q9.pdfIn PDF document text
    • http://indital.fun/784720133dkwov.pdfIn PDF document text
    • http://meetsoda.pro/72019894622anic3.pdfIn PDF document text
    • http://draiwenstore.online/tascam_dp-006_drumsogwj7.pdfIn PDF document text
    • http://idealica-official-it.website/18371496754wzk84.pdfIn PDF document text
    • http://hayatevesigar.online/zexajifojewagupuxuwupirae6q35.pdfIn PDF document text
    • http://svarka-aurora.online/how_many_of_the_100_books_are_there25pvy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/21581022582.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_10897ae7e28241408e12d95f7c7f3120.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72be2cbe-891d-4421-bd8d-8fb50ac1cd35/oracle_sql_advanced_queries.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_bf969e5e66d9484d9ca90651f827b7f0.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_0c117d5e01594d88a0f44a16d7f90874.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_38cfb29659d442928d50a14e0ceaea27.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_9c90fcbd69a84c61b5fc1960dc88608a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25c055c-958b-4369-87c4-f13db8f51568/understanding_space_an_introduction_to_astronautics_4th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af05c477-5279-45fa-96c4-19bb8bcd7e40/dari_alexander_salary.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_0640ea33c56b45bfb704c613d96c7952.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_5b8eeabac69e42158154b3ce8e85471b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wisuw/angular_7_form_validation_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127a5d90-98cc-49b4-b114-10d3b5bbad0c/why_does_my_insignia_tv_have_a_flashing_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49085133-d544-4cce-9a81-ec5e2d554295/razumotivo.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_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 5256 bytes
SHA-256: fb3b7b685a2ee4cbd46403a6499069b9e3961899dcea83487e5c4cdb3a2db73d
font_01_sfnt_off00014c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4E 10608 bytes
SHA-256: 28a7880c1d044847c3bc9039c7bae6f2dbe11da7cdff9bb4218d46dd55e57249