Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2271e3d4ccf5659…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 05:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3860dada9e069914a5f800241b687de5 SHA-1: 92c4b2da6e08755dbf5b13af7c4ea2e1341d5d0f SHA-256: e2271e3d4ccf5659dae02e1310e3546e945a7cf7bcad35c1f7da0899ddab4d69
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used to redirect users to further malicious content. ClamAV detection and ML classification strongly indicate malicious intent.

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://baarspo.ru/strik?utm_term=200+ways+the+quran+corrects+the+bible+pdf PDF link annotation
    • https://cdn.sqhk.co/tosilura/vhmjbwK/627702239.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/sEifgeq/baby_shower_bingo_games_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/NjegSie/36588775943.pdfIn PDF document text
    • https://cdn.sqhk.co/nexapebevux/gfidibE/myocardial_revascularization_acc_aha_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/fUvicLl/injury_report_nba_playoffs.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/JgiGmge/cars_for_sale_under_5000_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/lulufebexefe/ibibA8F/vatonozejapedivawake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_1bd93bdcb0f04068bf495d95aadd4fcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/the_chronicles_of_narnia_movies_online.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_f78d3a55ba354776a90d18e6ae4c64bb.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_d212ab2c12c040058a791108e9f9cfad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/differential_equations_by_dennis_g_zill_9th_edition_solutions.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_e7412e24b7e847318b43ca0d5d4f9435.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_88fd3b7dd57145b6bf86a1f7c58b00ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/marksheet_verification_agra_university.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_f5166f9f20de4142bce3e9cec5ac63fd.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_60b45343ddc44c34b5fe829ee47a59b9.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_2135f8df7f08408681a745058dae93ed.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_8cef3f64e2474e57956d797b395851fd.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_e41520e728844f18b50ad5bf715d3bd8.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_88d36032188543e1929f45924218a557.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_e940a01f33e645ff8ccf6d8f987780e6.pdf?index=trueIn 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_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 5884 bytes
SHA-256: f73900614e9b3716694ae5d173d693a74c43570330214fb038710de93ee92d71
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 11192 bytes
SHA-256: 2ea61362efb49060b813073af7ad1c511ab3ed44eb924531e5dc328406350d0c