Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43035fe8d09befe…

MALICIOUS

PDF

69.8 KB Created: 2021-04-11 21:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d8c72ee34347f2e2dad591af365b13 SHA-1: 205aa3cafe3bee2d8faa0d22437c465f7b37b416 SHA-256: f43035fe8d09befe3b1646f260e2b4d2e60bb3b1c3157894bfaa1649b16100ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and the ClamAV detection. The embedded URLs and the ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=in+the+reaction+n2+3h2+2nh3+the+rate+of+appearance
    • http://good-production16.site/mewubegobedigajarudef4icu.pdf
    • http://watepavamosem.sportsontheweb.net/beetroot_health_benefits.pdf
    • http://gbo.guru/zorepetjogin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_c115167bc5f946ecb2fac717dc9cd357.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a99d87f-e7f6-4735-a980-d816e7396180/noam_chomsky_theory_stages.pdf
    • https://uploads.strikinglycdn.com/files/ebb95102-f6fb-4bc4-b884-7b32e5280df9/jobodejegelopo.pdf
    • https://s3.amazonaws.com/genukopapovixo/pitagerajolibaperun.pdf
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_46d9925eff1643d18808781ca36a327b.pdf?index=true
    • https://s3.amazonaws.com/tajimipojimo/48446619846.pdf
    • https://uploads.strikinglycdn.com/files/fa57aed7-0724-4a5e-8105-da7804c2e025/63398111185.pdf
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_5d0ddfb6d8624834897e61cb17c6df6e.pdf?index=true
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_3b93119e7b95430791bfb2d835980f34.pdf?index=true
    • https://uploads.strikinglycdn.com/files/60e42895-5ef5-4898-a3f2-d8ed3d91a226/keneketajevoponikekamad.pdf
    • https://uploads.strikinglycdn.com/files/e4730328-be5d-44e0-ac87-ba33c3a2e9ac/56170496832.pdf
    • https://s3.amazonaws.com/zuguvoxoki/caltech_application_form.pdf
    • https://uploads.strikinglycdn.com/files/7b10db70-14e4-41ca-b96e-7be5f54ab399/how_to_repair_loose_elastic_waistband.pdf
    • https://uploads.strikinglycdn.com/files/e9b801d0-973f-40b0-a97b-a5a063ac84d9/what_temperature_should_a_spiral_ham_be_cooked_at.pdf
    • https://s3.amazonaws.com/vavejijitatofu/computer_systems_randal_bryant.pdf
    • http://bepolujogox.atwebpages.com/89010124980.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d117.bin
8da7b8a5f1617e9cf1e7cf41073349478efeab63c576655f7a1a1575a5a9034d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 5128 bytes
font_01_sfnt_off0000e288.bin
54202e1831f42688267cba558f7a46c25e3939942b7267fa683e29b8a2a8639d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 11492 bytes

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