Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a0188a71331748…

MALICIOUS

PDF

84.1 KB Created: 2021-03-23 03:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0ce2f32758c11fa77a6248674e2a57f9 SHA-1: a8b8ca78782aa7344a04cc9ed2c0859c7012bf4e SHA-256: 91a0188a71331748f6dcb39a55abded0f6f07d9c85efc103c6d2f6d1e2ef296a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://resalured.ru/award?keyword=ccvc+words+list+pdf PDF link annotation
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/funapesuviw.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/jOggigg/96741460703.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/Jibijw2/datagilelawazu.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/xoledagokojasipenebi.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/how_to_evaluate_data_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/hiaifxt/blood_oxygen_saturation_98.pdfIn PDF document text
    • https://ligunetanojuwid.weebly.com/uploads/1/3/4/6/134625742/nuzunefigivet.pdfIn PDF document text
    • https://nalufubuxozukex.weebly.com/uploads/1/3/4/4/134479837/9902504.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/jalasilunaz/probability_examples_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/wivovefa.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/serie_chicago_pd_5_temporada_dublado.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_a86469b277864f3783665c57ba734ad8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xelimewat/what_is_my_strawman.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/inverse_trigonometric_functions_worksheet_answers.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_e2ef167afa0a48c899ad864fa055ebb5.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_eb7edb60a2b54645a3ecaf304a93a67e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/funciones_del_auditor_de_sistemas_informaticos.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/breakdown_torque_load_performance_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/how_to_avoid_spanish_wealth_tax.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/programa_de_estudios_2011_tercer_grado_primaria.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_91dfe840313146ebb3f01acdb3659f34.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_b98debaa4c314494a257fdd8b5fc627c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/dow_blood_test_report_online.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/the_tin_forest_old_man.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_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 4996 bytes
SHA-256: 4f79f0d13da669fe8d5f4f3ec9f84db544e89838e7ca23d53ce484ac2fa38d61
font_01_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 11568 bytes
SHA-256: f45c85de1304f438d387e665cbb50be69fffe7bb6b7da80af2e86a5762b85e7e

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