Malicious PDF — malware analysis report

Static analysis result for SHA-256 b433568708810dbe…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 02:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f397e3ffd6e9eec9a8baf9231568b249 SHA-1: 64eee397f8f449dc273b81bc30679c58e8d597a4 SHA-256: b433568708810dbe1b4a17e55d35c281641b29ac6372f4837cf3846bdd54d5d3
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely for SEO manipulation or to redirect users to malicious sites. The primary suspicious URL identified is https://zajinet.ru/award?keyword=aspen+plus+v10+tutorial+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9660

Heuristics 4

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://zajinet.ru/award?keyword=aspen+plus+v10+tutorial+pdf
    • https://cdn-cms.f-static.net/uploads/4451205/normal_6023055919674.pdf
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5fefc02bd992b.pdf
    • https://cdn-cms.f-static.net/uploads/4386824/normal_6042e8f8d9633.pdf
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5feb5f8a8373d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takateg/82652650037.pdf
    • https://s3.amazonaws.com/tarizirefevifab/68764241236.pdf
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_4e90325c94924b28ac569962a4475227.pdf?index=true
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_fb260bfefea44284bb49edf51b6dd47e.pdf?index=true
    • https://s3.amazonaws.com/gajabedafot/manual_de_primeros_auxilios_psicologicos_oms.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/what_does_ref_code_s0900_mean_for_comcast.pdf
    • https://s3.amazonaws.com/jivamubug/35191140781.pdf
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_c73ca0d070d74072a02fd347f962d53f.pdf?index=true
    • https://s3.amazonaws.com/vibuvomomuv/colon_polyp_surveillance_guidelines_2017.pdf
    • https://uploads.strikinglycdn.com/files/a796e17d-4fbd-4eb1-8f26-a822597aa773/basic_radiological_physics_k_thayalan_download.pdf
    • https://uploads.strikinglycdn.com/files/d71b63d8-c6dd-46a3-a2c8-638286b1933b/97657152300.pdf
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_5465ae596ae14722a9413859405c67d7.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_fe35f7024a5e41b4a6bce56f700d0fc0.pdf?index=true
    • https://s3.amazonaws.com/tuxenipup/executive_summary_for_project_proposal_template.pdf
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_cfef7a0cc82d43b6bcfb459fcf8d81a7.pdf?index=true
    • https://s3.amazonaws.com/tosevud/23285239471.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_27c765cf60444989bf3e1191f36f4afd.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc81.bin
61377753118286015bc38ef099854d6344850efa68b7067eed68544a511f72fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 5280 bytes
font_01_sfnt_off00010e93.bin
376ab6d0f7601b8db440d8bb9a6a76a26ed6d2635c81e4d1e3ea124995d10fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 11376 bytes