Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4445479605f453…

MALICIOUS

PDF

86.8 KB Created: 2021-03-24 17:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d912c18a525169542869c39dce4ef806 SHA-1: c5bed7edd7ca9e35ad7ca6cd786185ad7e37b10b SHA-256: 1a4445479605f4531fb7dda5a65b97c6d7936c43797de57e73790c5919d2130a
126 Risk Score

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 0.9995

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=integration+of+2%252B3+cos+x%252Fsin%255E2x PDF link annotation
    • http://kakafeg.scienceontheweb.net/dobipopoxunizoxis.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/anti_ragging_form_aicte.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/iXAOZib/nusobavuj.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/bills_of_exchange_act_1882_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/gdx5bnL/classdojo_for_parents.pdfIn PDF document text
    • http://foriponawu.iblogger.org/semillas_amilaceas.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/administracion_financiera_libro.pdfIn PDF document text
    • http://kokijejon.22web.org/saditokizor.pdfIn PDF document text
    • http://visionnew.xyz/gekemomezimvqttg.pdfIn PDF document text
    • http://brumbum3.xyz/oae_025_study_guide6iqjv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/4615c577-abbf-471e-829c-a0e62fada9f1/how_many_electrons_can_a_molecular_orbital_hold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83db931-113e-44ef-9865-87a3a5b66c9d/how_to_address_a_navy_warrant_officer_in_the_army.pdfIn PDF document text
    • http://wenares.myartsonline.com/83283413888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e22ad7-600f-4aa7-a610-3001a0353d24/da061l-3d_motherboard_bios.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/how_to_win_the_pick_3_lottery_strategy.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 5404 bytes
SHA-256: 691306874d9ca4aadddee6f7fc8ae3fc248e624ad0a19e05770c29132d3e6b00
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 8824 bytes
SHA-256: 1546496c1968de61d23c8e3b976f5052d70e1c7633e090d101969f964e167fa3
font_02_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 11792 bytes
SHA-256: 94496e00f5206ce8b54a8f40c3953f88a30d56dcef0720ab9ab812b823f991ee
font_03_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 16168 bytes
SHA-256: 8c1e3298cb301b6aa2c2aeff0a89e1cafee6626e56d5ffa98ad52a7598c40df9
font_04_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 4940 bytes
SHA-256: 43a527d8dcdf63d7e50388a8cbf56e9b533da94ac9006f665f2379b99ae38479